Ethylene-based polymer, polyethylene-based resin composition and use thereof, catalyst component for olefin polymerization, olefin polymerization catalyst containing the component, and method for producing ethylene-based polymer by using the catalyst

ABSTRACT

An object of the present invention is to provide a polyethylene-based resin composition excellent in the moldability and at the same time, excellent in the balance between impact strength and stiffness as well as in the transparency, and a molded product and a film, which are obtained by the molding of the polyethylene-based resin composition. The polyethylene-based resin composition of the present invention comprises from 41 to 99 wt % of (A) an ethylene-based polymer satisfying specific conditions and from 1 to 59 wt % (B) an ethylene-based polymer satisfying specific conditions, wherein MFR of the composition as a whole is from 0.05 to 50 g/10 min and the density is from 0.910 to 0.960 g/cm 3 .

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Divisional application of U.S. Ser. No. 14/008,965, filed Sep. 30, 2013, now allowed; which is a 371 of PCT/JP2012/058491, filed Mar. 29, 2012, the disclosure of which is incorporated herein by reference in its entirety. This application claims priority to Japan Patent Application 2011-073937, filed Mar. 30, 2011; and Japan Patent Application 2011-073945, filed Mar. 30, 2011, the disclosures of which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present invention relates to an ethylene-based polymer having a developed long-chain branched structure and excellent in the moldability. As another aspect of the present invention, the present invention relates to a novel polyethylene-based resin composition and use thereof. More specifically, the present invention relates to a polyethylene-based resin composition excellent in the moldability and capable of producing a molded product excellent in the balance between impact strength and stiffness as well as in the transparency, and a molded product and a film each obtained by the injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding or blow molding of the polyethylene-based resin composition. Furthermore, the present invention relates to an olefin polymerization catalyst component containing a specific metallocene compound, an olefin polymerization catalyst containing the component, and a method for producing an olefin-based polymer by using the catalyst.

BACKGROUND ART

Recently, a film, a sheet, an injection molded product, a pipe, an ejection molded product, a hollow molded product and the like, which are made of a plastic, are used actively in various industrial fields. Among others, a polyethylene-based resin (ethylene-based polymer) finds widespread use, because this is, for example, inexpensive, lightweight and excellent in the moldability, stiffness, impact strength, transparency, chemical resistance and recyclability. In general, molding of the polyethylene-based resin is preformed in a molten state. However, in the case of an ethylene-based polymer alone, its melting characteristics may be insufficient, for example, in terms of flowability or the elongational viscosity may be inadequate, and in many cases, sufficient moldability can be hardly ensured or solid physical properties such as transparency and stiffness may lack.

As for the measure taken to compensate these deficiencies, a high-pressure polyethylene (HPLD) excellent in the moldability or an ethylene-based polymer differing in the molecular weight or density has been blended to improve the melting characteristics or solid physical properties (see, for example, Patent Documents 1 to 3).

Such a blend (ethylene-based resin composition) may satisfy the moldability but has a problem that reduction in the impact strength may be caused due to blending of HPLD or the molecular weight distribution or copolymerization composition distribution may be broadened to worsen the transparency.

Also, due to enforcement of the Containers Recycle Law or recent trend of resource saving, the amount of a raw material resin used needs to be reduced and from this standpoint, the demand for reduction in the wall thickness of a molded product is increasing, but in order to reduce the wall thickness, the stiffness (modulus) as well as the impact strength must be improved.

As the method for improving the impact strength, a method of reducing the density of the ethylene-based polymer is well known, but this method is disadvantageous in that the stiffness is also reduced (the polymer becomes soft), and for the purpose of reducing the wall thickness, there has been made, for example, an attempt to use a three-component blend composition obtained by further adding a specific HPLD to a combination of two kinds of specific ethylene.α-olefin copolymers differing in the density so as to enhance the moldability or transparency (see, for example, Patent Document 4).

According to this method, a polyethylene resin composition more excellent in the balance between impact strength and stiffness and also in the transparency than conventional compositions may be obtained, but the impact strength is unavoidably reduced due to blending of HPLD and furthermore, from the standpoint of stably supplying a product of constant quality in industrial level, a blend of three kinds of ethylene-based polymers is considered to be economically disadvantageous as compared with conventional compositions.

On the other hand, as to the method for improving the moldability, an attempt to introduce a long-chain branched structure capable of increasing the melt viscosity into an ethylene-based polymer has been made, but since the design for optimizing the long-chain branched structure is insufficient, reduction in the strength or transparency still cannot be avoided and the improvement level of moldability is yet low (see, for example, Patent Documents 5 to 8).

The polyolefin produced using a metallocene catalyst for olefin polymerization has a high uniformity in the polymer molecular structure such as molecular weight distribution or copolymerization composition distribution and is excellent in various mechanical properties such as impact strength and long lifetime and therefore, the amount used thereof is recently increasing. The metallocene-based polyolefin is excellent in various mechanical properties but, because of its narrow molecular weight distribution, is poor in the characteristics important to molding of a polyolefin, such as melt tension and melt flowability, and cannot satisfy sufficient performance in terms of mold processing.

As the method for improving the insufficient mold processability of the metallocene-based polyolefin, a method where the melt viscosity is increased by introducing a long-chain branch into a polyethylene by a polymerization reaction using a specific metallocene complex and the flowability or melt tension is thereby improved, is well known (see, for example, Patent Document 9). With respect to the specific metallocene complex for introducing a long-chain branch, a method using a bridged bisindenyl complex (see, for example, Patent Documents 10 to 13) or a constrained geometry half-metallocene complex (see, for example, Patent Document 14) is well known, but the long-chain branch obtained by such a method does not develop as in the structure of HPLD, and the improvement of melt viscosity of the polymer is not sufficient.

Also, as to the method for introducing a long-chain branch by a metallocene complex other than those described above, a method for producing a long-chain branch-containing polyethylene by using a bridged metallocene catalyst having a specific structure is known (see, for example, Patent Document 15), and specifically, an example of simultaneously using two kinds of metallocene complexes of dimethylsilylbis(pentadienyl)zirconium dichloride and diphenylmethylene(cyclopentadienyl)(fluorenyl)zirconium dichloride is shown. As the improved technology thereof, furthermore, a catalyst where the above-described two kinds of complexes are co-supported on the same support (see, for example, Patent Documents 16 to 18), and a catalyst where the kind of the complex combined is improved (see, for example, Patent Documents 19 and 20), are known. In these methods, it is supposed that one kind of a complex produces a polymer having a polymerizable double bond at the terminal (so-called macromer) and another complex is a complex excellent in the copolymerizability and copolymerizes with the macromer to form a long-chain branched structure.

Such a method may achieve introduction of a branched structure that is somewhat more developed than the long-chain branched structure by the conventional metallocene complex, but the level of development is still insufficient or those two kinds of metallocene complexes greatly differ in the copolymerizability of a comonomer, giving rise to a problem that the copolymerization composition distribution of the produced polymer may be broadened or the mechanical properties may deteriorate in association with production of a low-melting-point polymer.

Patent Document 21 has reported that when homopolymerization of ethylene is performed according to solution polymerization by using an asymmetric metallocene in which a cyclopentadienyl group and an indenyl group are carbon-bridged and methylaluminoxane, a branch-containing polyethylene can be produced, but the carbon number indicative of the branch length is from 1 to 20. Thus, the branch length is too short to exert an effect of improving mold processability as a long-chain branch, failing in exhibiting strain hardening of the elongational viscosity.

Also, Patent Document 22 has reported polymerization of propylene by a polymerization catalyst prepared by combining an asymmetric metallocene compound in which a cyclopentadienyl group and an indenyl group, each having a specific substituent, are bridged, with methylaminoxane, but this document is silent on the possibility of producing a long-chain branch when the polymerization above is applied to polymerization of ethylene, and the effect of improving the mold processability cannot be expected.

Furthermore, Patent Document 23 has reported a catalyst system capable of producing an ethylene polymer and an ethylene/butene copolymer, which are useful as a macromonomer, by using, out of asymmetric metallocenes in which a cyclopentadienyl group and an indenyl group are silicon-bridged, a metallocene having a methyl group on the 2-, 4- and 7-positions of the indenyl group and a modified clay compound, but the number of terminal double bonds of the polymer is small, and this document is silent on the possibility of producing a long-chain branch by this catalyst alone.

Recently, the present inventors have reported in Patent Document 24 a method for producing an ethylene-based polymer improved in the mold processability by using a supported catalyst for olefin polymerization comprising, as an essential component, out of asymmetric metallocenes in which a cyclopentadienyl group and an indenyl group are bridged by a bridging group, a specific asymmetric metallocene having no substituent except for the bridging group on the cyclopentadienyl group and having a hydrogen atom or a specific substituent on the 3-position of the indenyl group. According to this method, an ethylene-based polymer having a large degree of strain hardening of the elongational viscosity is obtained and therefore, the mold processability is improved as compared with the conventional long-chain branched polyethylene, but since the long-chain branching index does not reach that of a high-pressure low-density polyethylene, more improvement of the long-chain branched structure is demanded.

Under these circumstances, it is required to solve the problems of the conventional ethylene-based resin composition and develop a polyethylene-based resin composition excellent in the moldability and capable of producing a molded product excellent in the balance between impact strength and stiffness as well as in the transparency. Furthermore, in order to solve the problems of a long-chain branch-containing polyethylene in conventional techniques and improve the mold processability of a metallocene-based polyethylene, it is required to develop an ethylene-based polymer having introduced thereinto a sufficiently large number of appropriate-length long-chain branches, an olefin polymerization catalyst excellent in the introduction of long-chain branch, and a production method of an olefin-based polymer.

BACKGROUND ART LITERATURE Patent Document

Patent Document 1: JP-A-7-149962 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”)

Patent Document 2: JP-A-9-31260

Patent Document 3: JP-A-2006-312753

Patent Document 4: JP-A-2010-31270

Patent Document 5: International Publication No. 97/10295

Patent Document 6: JP-A-2006-63325

Patent Document 7: JP-A-2006-124567

Patent Document 8: JP-A-2007-197722

Patent Document 9: JP-A-2-276807

Patent Document 10: JP-A-8-48711

Patent Document 11: JP-A-8-311260

Patent Document 12: JP-A-2004-149760

Patent Document 13: JP-A-2004-217924

Patent Document 14: JP-A-6-306121

Patent Document 15: JP-A-7-252311

Patent Document 16: JP-A-2006-233208

Patent Document 17: JP-A-2006-321991

Patent Document 18: JP-T-2007-520597 (the term “JP-T” as used herein means a published Japanese translation of a PCT patent application)

Patent Document 19: JP-T-2002-515521

Patent Document 20: JP-A-2009-144148

Patent Document 21: JP-A-5-043619

Patent Document 22: JP-A-7-224079

Patent Document 23: JP-A-2008-050278

Patent Document 24: JP-A-2011-137146

SUMMARY OF THE INVENTION Problems that the Invention is to Solve

An object of the present invention is, considering the above-described problems of conventional techniques, to provide an ethylene-based polymer improved in the mold processability. Another object of the present invention is, considering the above-described problems of conventional techniques, to provide a polyethylene-based resin composition excellent in the molding characteristics and at the same time, excellent in the balance between impact strength and stiffness as well as in the transparency; provide a molded product excellent in the balance between impact strength and stiffness and also in the transparency, which is obtained by the injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding, blow molding or inflation molding of the polyethylene-based resin composition; and provide use of the molded product. Still another object of the present invention is to provide an olefin polymerization catalyst component capable of producing a metallocene-based polyolefin or a metallocene-based polyethylene, in which a sufficiently large number of appropriate length long-chain branches are introduced so as to improve the mold processability of a metallocene-based polyolefin, particularly a metallocene-based polyethylene; an olefin polymerization catalyst containing the component; and a method for producing an olefin-based polymer by using the catalyst.

Incidentally, in the present invention, the polyethylene is a general term of an ethylene homopolymer and a copolymer of ethylene and the later-described olefin and can be restated as an ethylene-based polymer.

Means for Solving the Problems

As a result of a number of intensive studies to attain the above-described objects, the present inventors have found that when a specific ethylene-based polymer having a small amount of long-chain branched structure characterized by the elongational viscosity behavior and a specific ethylene-based polymer having a specific long-chain branched structure similarly characterized by the elongational viscosity behavior are combined and these two polymers are blended to give a specific MFR and a specific density, the obtained polyethylene-based resin composition exhibits good characteristics capable of solving the above-described problems. The present inventors have been accomplished based on this finding.

That is, according to a first aspect of the present invention, an ethylene-based polymer satisfying the following condition (B-1′) to condition (B-6) is provided.

(B-1′) MFR_(B)=0.001 to 200 g/10 min,

(B-2″) Density_(B)=0.880 to 0.970 g/cm³,

(B-3) [Mw/Mn]_(B)=2.0 to 10.0,

(B-4′) in a double logarithmic plot of elongational viscosity η(t) (unit: Pa·sec) and elongation time t (unit: sec) measured at a temperature of 170° C. and an elongational strain rate of 2 (unit: 1/sec), an inflection point of the elongational viscosity attributable to strain hardening is not observed, or when the inflection point is observed, assuming that the maximum elongational viscosity after strain hardening is η_(B;Max)(t₁) and the approximate straight line of the elongational viscosity before hardening is η_(B;Linear)(t), the degree of strain hardening [λmax(2.0)]_(B) defined by η_(B;Max)(t₁)/η_(B;Linear)(t₁) is from 1.2 to 30.0,

(B-5) the ratio [λmax(2.0)]_(B)/[λmax(0.1)]_(B) of [λmax(2.0)]_(B) defined in the same manner as in the condition (B-4′) and [λmax(0.1)]_(B) measured similarly by setting the elongational strain rate to 0.1 (unit: 1/sec) is from 1.2 to 10.0, and

(B-6) the polymer is produced by an ethylene polymerization reaction using a transition metal-containing catalyst.

According to a second aspect of the present invention, the ethylene-based polymer in the first aspect of the present invention, further satisfying at least one of the following condition (B-7) and condition (B-8) is provided:

(B-7) the branching index (g_(C)′) at a molecular weight of 1,000,000 as measured by a GPC measurement apparatus combining a differential refractometer, a viscosity detector and a light scattering detector is from 0.30 to 0.70, and

(B-8) the content (W_(C)) of components having a molecular weight of 1,000,000 or more as measured by a GPC measurement apparatus combining a differential refractometer, a viscosity detector and a light scattering detector is from 0.01 to 30%.

According to a third aspect of the present invention, a polyethylene-based resin composition comprising: (A) from 41 to 99 wt % of an ethylene-based polymer satisfying the following condition (A-1) to condition (A-4); and (B) from 1 to 59 wt % of the ethylene-based polymer claimed in claim 1 or 2, wherein MFR of the composition as a whole is from 0.05 to 50 g/10 min and the density is from 0.910 to 0.960 g/cm³, is provided:

Conditions of Ethylene-Based Polymer (A):

(A-1) MFR_(A)=0.3 to 100 g/10 min,

(A-2) Density_(A)=0.915 to 0.970 g/cm³,

(A-3) [Mw/Mn]_(A)=2.0 to 10.0, and

(A-4) in a double logarithmic plot of elongational viscosity η(t) (unit: Pa·sec) and elongation time t (unit: sec) measured at a temperature of 170° C. and an elongational strain rate of 2 (unit: 1/sec), an inflection point of the elongational viscosity attributable to strain hardening is not observed, or when the inflection point is observed, assuming that the maximum elongational viscosity after strain hardening is η_(A;Max)(t₁) and the approximate straight line of the elongational viscosity before hardening is η_(A;Linear)(t), the degree of strain hardening [λmax(2.0)]_(A) defined by η_(A;Max)(t₁)/η_(A;Linear)(t₁) is from 1.0 to 2.0.

According to a fourth aspect of the present invention, the polyethylene-based resin composition in the the third aspect of the present invention, wherein said ethylene-based polymer (B) satisfies the following condition (B-1) to condition (B-6), is provided:

Conditions of Ethylene-Based Polymer (B):

(B-1) MFR_(B)=0.01 to 1.5 g/10 min and 100>MFR_(A)/MFR_(B)>1.0,

(B-2) Density_(B)=0.880 to 0.940 g/cm³,

(B-3) [Mw/Mn]_(B)=2.0 to 10.0,

(B-4) [λmax(2.0)]_(B) defined in the same manner as in the condition (A-4) of the third aspect of the present invention is from 1.2 to 20.0 and 20>[λmax(2.0)]_(B)/[λmax(2.0)]_(A)>1.0,

(B-5) the ratio [λmax(2.0)]_(B)/[λmax(0.1)]_(B) of [λmax(2.0)]_(B) defined in the same manner as in the condition (A-4) of the third aspect of the present invention and [λmax(0.1)]_(B) measured similarly by setting the elongational strain rate to 0.1 (unit: 1/sec) is from 1.2 to 10.0, and

(B-6) the polymer is produced by an ethylene polymerization reaction using a transition metal-containing catalyst.

According to a fifth aspect of the present invention, the polyethylene-based resin composition in the the third aspect of the present invention, wherein said ethylene-based polymer (B) further satisfies the following condition (B-2′), is provided:

(B-2′) 1.070>density_(A)/density_(B)>0.990.

According to a sixth aspect of the present invention, the polyethylene-based resin composition in the the third aspect of the present invention, wherein said ethylene-based polymer (A) is an ethylene polymer or ethylene⋅α-olefin copolymer produced by homopolymerization of ethylene or copolymerization with an α-olefin caused by a Ziegler-Natta catalyst produced using a magnesium compound and a titanium compound, is provided.

According to a seventh aspect of the present invention, a molded product obtained by an injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding or blow molding of the polyethylene-based resin composition in the third aspect of the present invention, is provided.

According to an eighth aspect of the present invention, a film obtained by an extrusion molding, hollow molding, blow molding or inflation molding of the polyethylene-based resin composition in the third aspect of the present invention.

According to a ninth aspect of the present invention, an olefin polymerization catalyst component comprising the following component (A-1b) and component (A-2b), is provided:

Component (A-1b): a metallocene compound represented by the following formula (1b):

[in formula (1b), M^(1b) represents any one transition metal of Ti, Zr and Hf; each of X^(1b) and X^(2b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1b) and Q^(2b) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1b) may combine to form a ring together with Q^(1b) and Q^(2b); m^(b) is 0 or 1 and when m^(b) is 0, Q^(1b) is bonded directly to the conjugated 5-membered ring including R^(2b) and R^(3b); and each of R^(2b), R^(3b) and R^(4b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40 and out of R^(2b), R^(3b) and R^(4b), only either one pair of adjacent R^(3b) and R^(3b) and adjacent R^(2b) and R^(3b) may form a ring together with the carbon atoms to which the pair is bonded], and

Component (A-2b): a metallocene compound represented by the following formula (2b):

[in formula (2b), M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20, Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b), R^(14b) and R^(15b) independently represents an atom or a group selected from a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, and a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that at least one member is not a hydrogen atom; each R^(13b) independently represents a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40; and out of R^(12b), R^(13b), R^(14b) and R^(15b), any only one pair of adjacent R^(12b) and R^(12b), adjacent R^(13b) and R^(13b) and adjacent R^(12b) and R^(13b) and any only one pair of adjacent R^(14b) and R^(14b), adjacent R^(15b) and R^(15b) and adjacent R^(14b) and R^(15b) may form a ring together with the carbon atoms to which the pair is bonded].

According to a tenth aspect of the present invention, an olefin polymerization catalyst component comprising a metallocene compound represented by the following formula (1c), is provided:

[in formula (1c), M^(1c) represents any one transition metal of Ti, Zr and Hf; each of X^(1c) and X^(2c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1c) and Q^(2c) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1c) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1c) may combine to form a ring together with Q^(1c) and Q^(2c); m^(c) is 0 or 1 and when m^(c) is 0, Q^(1c) is bonded directly to the conjugated 5-membered ring including R^(2c); each of R^(2c) and R^(4c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and R^(3c) represents a substituted aryl group represented by the following formula (1-ac)]:

[in formula (1-ac), Y^(1c) represents an atom of Group 14, Group 15 or Group 16 of the periodic table; each of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing oxygen or nitrogen and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; adjacent groups of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) may combine with each other to form a ring together with the atoms bonded to these groups; n^(c) is 0 or 1 and when n^(c) is 0, the substituent Rx is not present on Y^(1c); and p^(c) is 0 or 1 and when p^(c) is 0, the carbon atom to which R^(7c) is bonded and the carbon atom to which R^(9c) is bonded are bonded directly; provided that when Y^(1c) is a carbon atom, at least one of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) is not a hydrogen atom].

According to an eleventh aspect of the present invention, an olefin polymerization catalyst comprising the olefin polymerization catalyst component in the ninth or tenth aspect of the present invention, is provided.

According to a twelfth aspect of the present invention, a production method of an ethylene-based polymer, comprising producing an ethylene-based polymer satisfying at least the condition (B-4′) among the conditions in the first aspect of the present invention by using an olefin polymerization catalyst containing the following components (A) and (B), is provided:

Component (A): at least any one of the following catalyst components (A-i) to (A-iii):

(A-i) the olefin polymerization catalyst component in the ninth aspect of the present invention,

(A-ii) the olefin polymerization catalyst component in the tenth aspect of the present invention, and

(A-iii) an olefin polymerization catalyst component containing a metallocene compound represented by the following formula (1d):

[in formula (1d), M^(1d) represents any one transition metal of Ti, Zr and Hf; each of X^(1d) and X^(2d) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1d) and Q^(2d) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1d) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1d) may combine to form a ring together with Q^(1d) and Q^(2d); m^(d) is 0 or 1 and when m^(d) is 0, Q^(1d) is bonded directly to the conjugated 5-membered ring including R^(2d) and R^(3d); each of R^(2d) and R^(3d) represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, provided that at least one R^(2d) is not a hydrogen atom; R^(4d) represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R^(4d) is bonded: R^(5d) is an atom or a group bonded to a carbon atom of R^(4d) and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and n^(d) represents an integer of 0 to 10 and when n^(d) is 2 or more, at least two R^(5d) may form a ring together with the carbon atoms to which R^(5d) are bonded], and

Component (B): a compound capable of reacting with a metallocene compound of the component (A) to produce a cationic metallocene compound.

According to a thirteenth aspect of the present invention, the ethylene-based polymer in the first aspect of the present invention, which is produced by the production method of an ethylene-based polymer in the twelfth aspect of the present invention, is provided.

According to a fourteenth aspect of the present invention, the polyethylene-based resin composition in the third aspect of the present invention, wherein said ethylene-based polymer is the ethylene-based polymer in the thirteenth aspect of the present invention, is provided.

Advantage of the Invention

According to the present invention, an ethylene-based polymer having a developed long-chain branched structure and excellent in the moldability can be provided.

The polyethylene-based resin composition of the present invention has excellent molding characteristics and at the same time, has an effect that the balance between impact strength and stiffness is excellent and furthermore, the transparency is excellent. In addition, the molded product by the injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding, blow molding or inflation molding of the polyethylene-based resin composition is also excellent in the balance between impact strength and stiffness as well as in the transparency, so that a molded product reduced in the wall thickness can be provided in an industrially advantageous manner.

Moreover, according to the present invention, a method for producing a metallocene-based polyolefin or metallocene-based polyethylene having a sufficiently large number of appropriate-length long-chain branches, wherein an olefin polymerization catalyst component containing a specific metallocene compound is prepared and the catalyst component is used for an olefin polymerization catalyst, can be provided. In turn, a method for improving the mold processability of a metallocene-based polyethylene can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing a base line and a section of a chromatogram used in the gel permeation chromatography (GPC) method.

FIG. 2 is a plot diagram of the elongational viscosity when an inflection point of elongational viscosity is observed (a typical example of the ethylene-based polymer (B) in Examples).

FIG. 3 is a plot diagram of the elongational viscosity when an inflection point of elongational viscosity is not observed (a typical example of the ethylene-based polymer (A) in Examples).

FIG. 4A is a molecular weight distribution curve calculated from the GPC-VIS measurement (branched structure analysis), and FIG. 4B is a graph showing the relationship between the branching index (g′) and the molecular weight (M).

MODE FOR CARRYING OUT THE INVENTION

The present invention relates to a polyethylene-based resin composition obtained by blending a specific ethylene-based polymer (A) having a small amount of long-chain branched structure characterized by the elongational viscosity behavior and a specific ethylene-based polymer (B) having a specific long-chain branched structure similarly characterized by the elongational viscosity behavior to give a specific MFR and a specific density; a molded product obtained by molding the polyethylene-based resin composition; and use of the molded product. The present invention is described below item by item.

[I] Polyethylene-Based Resin Composition of the Present Invention

The polyethylene-based resin composition of the present invention is characterized by containing from 41 to 99 wt % of (A) an ethylene-based polymer satisfying specific conditions (A-1) to (A-4) (hereinafter, sometimes simply referred to as component (A)) and from 1 to 59 wt % of (B) an ethylene-based polymer satisfying specific conditions (B-1) to (B-6) (hereinafter, sometimes simply referred to as component (B)), wherein MFR of the composition as a whole is from 0.05 to 50 g/10 min and the density is from 0.910 to 0.960 g/cm³. Respective components constituting the polyethylene-based resin composition of the present invention, characteristics thereof, and the like are described below.

(1) Ethylene-Based Polymer (A)

The compound (A) that is one of components constituting the polyethylene-based resin composition of the present invention satisfies all of the conditions (A-1) to (A-4) described below.

1-1. Condition (A-1)

The melt flow rate (MFR_(A)) of the component (A) in the present invention is from 0.3 to 100 g/10 min, preferably from 0.9 to 20 g/10 min, more preferably from 1.4 to 10 g/10 min.

If MFR_(A) is less than 0.3 g/10 min, the polyethylene-based resin composition may be inferior in the moldability, particularly in the melt flowability and spreadability, and if MFR_(A) exceeds 100 g/10 min, the polyethylene-based resin composition or its molded product may be disadvantageously reduced in the mechanical strength such as impact strength, tear strength and tensile strength. Incidentally, in the present invention. MFR of the ethylene-based polymer and polyethylene-based resin composition indicates a value when measured under the conditions of 190° C. and a load of 21.18 N (2.16 kg) in accordance with “Test Method for Melt Flow Rate (MFR) and Melt Volume Flow Rate (MVR) of Plastics-Thermoplastics” of JIS K7210.

1-2. Condition (A-2)

The density_(A) of the ethylene-based polymer (A) in the present invention is from 0.915 to 0.970 g/cm³, preferably from 0.917 to 0.950 g/cm³, more preferably from 0.925 to 0.940 g/cm³.

When the density_(A) is in this range, the polyethylene-based resin composition or its molded product is excellent in the balance between impact strength and stiffness and in the transparency. On the other hand, if the density_(A), is less than 0.915 g/cm³, the stiffness is reduced and when the product is a molded product having a small thickness, such as film and sheet, as well as various problems in using the product, a problem is disadvantageously brought about in the step of winding up the product or the post-processing step such as surface printing⋅lamination or when the product is a molded product having a large wall thickness, such as pipe and various containers, since the product is too soft and undergoes deformation, the wall thickness must be disadvantageously designed to be larger than necessary. Also, if the density_(A) exceeds 0.970 g/cm³, the impact strength or transparency is deteriorated and this is not preferred. Incidentally, in the present invention, the density of the ethylene-based polymer or the polyethylene-based resin composition indicates a value when measured by the following method.

Pellets are hot-pressed to prepare a 2 mm-thick press sheet, and this sheet is placed in a beaker having a volume of 1,000 ml. The beaker is filled with distilled water, covered with a watch glass, heated by a mantle heater and after coming to a boil, the distilled water was boiled for 60 minutes. Thereafter, the beaker is placed on a wooden table and allowed to cool. In this operation, the amount of the boiling distilled water after boiling for 60 minutes is set to 500 ml, and the period of time until reaching room temperature is adjusted not to fall below 60 minutes. Furthermore, the test sheet is immersed in a nearly central part of the water while keeping it away from contact with the beaker or water surface. The sheet is annealed for 16 to 24 hours under the conditions of 23° C. and a humidity of 50%, then punched into 2-mm squares, and measured at a test temperature of 23° C. in accordance with “Test Method for Density and Specific Gravity of Plastics-Unfoamable Plastics” of JIS K7112.

1-3. Condition (A-3)

The ratio ([Mw/Mn]_(A)) between weight average molecular weight (Mw) and number average molecular weight (Mn) of the component (A) in the present invention is from 2.0 to 10.0, preferably from 2.5 to 10.0, more preferably from 2.9 to 5.0. If [Mw/Mn]_(A) is less than 2.0, the polyethylene-based resin composition may be inferior in the moldability, particularly in the melt flowability, or the polymer may be difficult to mix with other polymer components and therefore, this should be avoided.

If [Mw/Mn]_(A) exceeds 10.0, the effect of improving the stiffness of the polyethylene-based resin composition or its molded product may be insufficient or the transparency may be deteriorated, and this is not preferred. Incidentally, in the present invention, each of Mw and Mn of the ethylene-based polymer or polyethylene-based resin composition indicates a value measured by gel permeation chromatography (GPC) method.

Conversion to molecular weight from retention volume is performed using a calibration curve prepared in advance with standard polystyrene. All of standard polystyrenes used are the following brands of Tosoh Corporation: F380, F288, F128, F80, F40, F20, F10, F4, F1, A5000, A2500 and A1000.

The calibration curve is prepared by injecting 0.2 mL of a solution after dissolving each standard polystyrene in ODCB (containing 0.5 mg/mL of BHT) to have a concentration of 0.5 mg/mL. As the calibration curve, a cubic expression obtained by approximation by the least square method is employed. For the viscosity expression ([η]=K×M^(α)) used in the conversion to the molecular weight, the following numerical values are used.

PS: K=1.38×10⁻⁴, α=0.7

PE: K=3.92×10⁻⁴, α=0.733

PP: K=1.03×10⁻⁴, α=0.78

Incidentally, the measurement conditions of GPC are as follows.

Instrument: GPC (ALC/GPC, 150C) manufactured by Waters

Detector: IR detector (measurement wavelength: 3.42 μm), MIRAN 1A, manufactured by FOXBORO

Column: AD806M/S (three) manufactured by Showa Denko

Moving phase solvent: o-dichlorobenzene

Measurement temperature: 140° C.

Flow rate: 1.0 ml/min

Injection volume: 0.2 ml

Preparation of sample: A 1 mg/mL solution of the sample is prepared using ODCB (containing 0.5 mg/mL of BHT) and dissolved over about 1 hour at 140° C.

Incidentally, a base line and a section of the obtained chromatogram are determined, for example, as shown in FIG. 1.

1-4. Condition (A-4)

The component (A) in the present invention satisfies the condition that in a double logarithmic plot of elongational viscosity η(t) (unit: Pa·sec) and elongation time t (unit: sec) measured at a temperature of 170° C. and an elongational strain rate of 2 (unit: 1/sec), an inflection point of the elongational viscosity attributable to strain hardening is not observed or when the inflection point is observed, assuming that the maximum elongational viscosity after strain hardening is η_(Max)(t₁) and the approximate straight line of the elongational viscosity before hardening is η_(Linear)(t), the degree of strain hardening [λmax(2.0)]_(A) defined by η_(Max)(t₁)/η_(Linear)(t₁) is from 1.0 to 2.0, preferably from 1.0 to 1.5, more preferably from 1.0 to 1.2, and in a most preferred case, the inflection point is not observed or [λmax(2.0)]_(A) is from 1.0 to 1.1. Here, the approximate straight line of the elongational viscosity before hardening is a tangent line having a smallest gradient (here, however, the gradient is 0 or a positive value) among tangent lines of a curve of the double logarithmic graph in the range of t corresponding to a strain amount of 0.2 to 1.0.

If [λmax(2.0)]_(A) is less than 1.0, the ethylene-based polymer, polyethylene-based resin composition or its molded product may be in a non-uniform molten state or may have a thermally unstable structure, and this is not preferred. If [λmax(2.0)]_(A) exceeds 2.0, the melt tension and flowability during molding may be excellent, but the polyethylene-based resin composition or its molded product may be disadvantageously reduced in the impact strength or transparency.

In general, a polyethylene is processed into an industrial product by a shaping method involving a molten state, such film molding, blow molding and foam molding, and at this time, the elongational flow characteristics represented by the above-described elongational viscosity or degree of strain hardening greatly affect the ease of molding.

That is, a polyethylene having a narrow molecular weight distribution and having no long-chain branch exhibits bad moldability because of its low melt strength, whereas a polyethylene having an ultrahigh molecular weight component or a long-chain branch component has a property of undergoing strain hardening during melt elongation, that is, abruptly rising in the elongational viscosity on the high strain side, and a polyethylene exhibiting this property outstandingly is excellent in the moldability. A polyethylene resin having such elongational flow characteristics has an effect of, for example, preventing uneven wall thickness or blown rupture of a product in the film molding or blow molding, enabling high-speed molding, or making it possible to raise the percentage of closed pores at the foam molding and provides for merits such as increase of strength of a molded article, enhancement of design property, reduction in weight, improvement of molding cycle, and elevation of heat insulating property. However, on the other hand, if the elongational flow characteristics are too strong, there may arise a problem, for example, the impact strength of the molded product may be reduced due to strength anisotropy that is presumed to be attributable to molecular orientation during molding, or the transparency may be deteriorated due to reduction in the surface smoothness of a molded product, which is presumed to be attributable to a property of the melt elasticity being too high.

As a result of intensive studies on a polyethylene-based resin composition with an attempt to improve the molding process bound up with the elongational flow characteristics of a polyethylene and overcome the problem in mechanical properties of a molded product by designing the long-chain branched structure as a main factor governing the elongational viscosity characteristics, it has been found that, as described above, when an ethylene-based polymer (A) having a small amount of long-chain branched structure is used as a high MFR main component of the resin composition, that is, as a main component on the low molecular weight side, the polymer is excellent in contribution to enhancement of mechanical properties, particularly stiffness, and furthermore, excellent in prevention of deterioration of the transparency.

With respect to the measurement method for the degree of strain hardening, as long as the uniaxial elongational viscosity can be measured, the same value is obtained in principle by any method, and details of the measurement method and measurement apparatus are described, for example, in known literature, Polymer, 42 (2001), 8663.

The measurement method and measurement apparatus preferred for measurement of the ethylene-based polymer of the present invention include the followings.

Measurement Method:

Apparatus: Ares manufactured by Rheometorics

Fixture: Extentional Viscosity Fixture, manufactured by T.A. Instrument

Measurement temperature: 170° C.

Strain rate: 2/sec

Preparation of test piece: A sheet having a size of 18 mm×10 mm and a thickness of 0.7 mm is prepared by press molding.

Calculation Method:

The elongational viscosity at 170° C. and a strain rate of 2/sec is plotted in a double logarithmic graph where the abscissa is the time t (sec) and the ordinate is the elongational viscosity η (Pa·sec). On this double logarithmic graph, assuming that the maximum elongational viscosity until reaching a strain amount of 4.0 after strain hardening is η_(Max)(t₁) (t₁ is the time at which the maximum elongational viscosity is shown) and the approximate straight line of the elongational viscosity before hardening is η_(Linear)(t), a value calculated as η_(Max)(t₁)/η_(Linear)(t₁) is defined as the degree of strain hardening (λmax). Incidentally, occurrence or no occurrence of strain hardening is judged by whether an inflection point at which the elongational viscosity is changed from an upwardly projecting curve to a downwardly projecting curve with the elapse of time is present or absent.

FIGS. 2 and 3 are plot diagrams of typical elongational viscosity. FIG. 2 is a case where an inflection point of elongational viscosity is observed, and η_(Max)(t₁) and η_(Linear)(t) are shown in the figure. FIG. 3 is a case where an inflection point of elongational viscosity is not observed.

1-5. Composition of Ethylene-Based Polymer (A)

The component (A) in the present invention is an ethylene homopolymer or a copolymer of ethylene and an α-olefin having a carbon number of 3 to 20. Examples of the α-olefin as a copolymerization component used here include propylene, butene-1, 3-methylbutene-1, 3-methylpentene-1, 4-methylpentene-1, pentene-1, hexene-1, heptene-1, octene-1, decene-1, tetradecene-1, hexadecene-1, octadecene-1, and eicocene-1. Only one of these α-olefins may be used, or two or more thereof may be used in combination. Among these, an α-olefin having a carbon number of 3 to 10 is preferred, and specific examples thereof include propylene, butene-1, 3-methylbutene-1, 4-methylpentene-1, pentene-1, hexene-1, heptene-1, octene-1, and decene-1. An α-olefin having a carbon number of 4 to 8 is more preferred, and specific examples thereof include butene-1, 3-methylbutene-1, 4-methylpentene-1, pentene-1, hexene-1, heptene-1, and octene-1. Particularly preferred α-olefins are butene-1, hexene-1, and octene-1. Incidentally, in the later-described olefin polymerization catalyst, even in the case of homopolymerization of ethylene, an α-olefin such as 1-butene and 1-hexene due to an ethylene oligomerization reaction may occur as a by-product in the polymerization system, or a reaction called “Chain-walking reaction” where a short-chain branch such as methyl group and ethyl group is produced in the main chain of an olefin polymer by an isomerization reaction of a bond between an active center metal and a terminal carbon at the growth terminal of olefin polymerization, is known, and the short-chain branched structure produced by such a reaction in the ethylene homopolymer is sometimes confused with the short-chain branched structure produced by copolymerization of an α-olefin.

Accordingly, the ethylene homopolymer as used in the present invention indicates a polymer produced as a result of polymerization proceeded without externally supplying an α-olefin as a comonomer, and the ethylene⋅α-olefin copolymer indicates a polymer produced as a result of polymerization performed by externally supplying the α-olefin. The term “ethylene-based polymer” is used for collectively referring to the ethylene homopolymer and the ethylene⋅α-olefin copolymer (including the later-described case of using, as a comonomer, a monomer except for an α-olefin).

The ratio of ethylene and an α-olefin in the ethylene-based polymer is from about 80 to 100 wt % of ethylene and from about 0 to 20 wt % of an α-olefin, preferably from about 85 to 99.9 wt % of ethylene and from about 0.1 to 15 wt % of an α-olefin, more preferably from about 90 to 99.5 wt % of ethylene and from about 0.5 to 10 wt % of an α-olefin, still more preferably from about 90 to 99 wt % of ethylene and from about 1 to 10 wt % of an α-olefin. When the ethylene content is in this range, the polyethylene-based resin composition or its molded product can have good balance between stiffness and impact strength.

The copolymerization may be any of alternate copolymerization, random copolymerization and block copolymerization. Of course, it is possible to use a small amount of a comonomer other than ethylene and an α-olefin, and in this case, the comonomer includes a compound having a polymerizable double bond, for example, styrenes such as styrene, 4-methylstyrene and 4-dimethylaminostyrene, dienes such as 1,4-butadiene, 1,5-hexadiene, 1,4-hexadiene and 1,7-octadiene, cyclic compounds such as norbornene and cyclopentene, and oxygen-containing compounds such as hexenol, hexenoic acid and methyl octenoate. However, in the case of using dienes, it is indisputable that the comonomer must be used within a range causing no development of a long-chain branched structure, that is, within a range satisfying the condition (A-4).

1-6. Production Method of Ethylene-Based Polymer (A)

As the component (A) in the present invention, an ethylene-based polymer having the composition above and satisfying all of the conditions (A-1) to (A-4) is produced and used. The production is performed by a method of homopolymerizing ethylene or copolymerizing ethylene with the above-described α-olefin, by using an olefin polymerization catalyst.

As the olefin polymerization catalyst, various kinds of catalysts are known at present, and the catalyst is not limited as long as the ethylene-based polymer (A) can be prepared within the limitations of the configuration of catalyst components and the design of polymerization conditions or post-processing conditions, but as an example of the technique suitable for the production of the ethylene-based polymer (A) and satisfying the profitability at the industrial level, specific examples include transition metal-containing catalysts for olefin polymerization described in the following (i) to (iv).

(i) Ziegler Catalyst

Examples of the olefin polymerization catalyst suitable for the production of the ethylene-based polymer (A) include a Ziegler-Natta catalyst that is an olefin coordination polymerization catalyst composed of a combination of a transition metal compound and an alkyl compound or the like of a typical metal. Above all, a so-called Mg—Ti type Ziegler catalyst in which a solid catalyst component obtained by loading a titanium compound on a magnesium compound and an organoaluminum compound are combined (refer, for example, to “Shokubai Katsyou Daijiten (Practical Dictionary of Catalysts); issued by Kogyo Chosakai, 2004” and “Shutsugan Keitou Zu -Olefin Jugo Shokubai no Hensen- (Application Flow Chart -History of Olefin Polymerization Catalyst-); issued by Japan Institute of Invention and Innovation, 1995”) is preferred, because this catalyst is inexpensive, highly active and excellent in the suitability for polymerization process.

Among others, an Mg/Ti catalyst supported on an inactive support material described in JP-A-54-142192 and JP-A-54-148093 is preferred. More specifically, examples thereof include a catalyst obtained by a process where a porous silica previously treated with triethylaluminum is impregnated with a uniform mixed solution of a tetrahydrofuran solution of anhydrous MgCl₂ and TiCl₃ or TiCl₄ and then dried to a solid state, and a catalyst obtained by applying preliminary olefin polymerization to an Mg/Ti catalyst in the presence of an organoaluminum described in JP-A-63-117019, for example, a preliminarily polymerized catalyst obtained by a process where a mixed solution of TiCl₄ and methylhydrogenpolysiloxane is introduced into a solid component obtained by the reaction of MgCl₂, Ti(OnBu)₄ and methylhydrogenpolysiloxane and the obtained catalyst is subjected to preliminary ethylene polymerization in the presence of triethylaluminum. Other examples include an olefin polymerization catalyst in which a low-valent titanium atom-containing catalyst component obtained by the reaction of a magnesium⋅aluminum composite material and a quadrivalent titanium compound is combined with an organoaluminum compound, described in JP-A-60-195108; a solid-state catalyst obtained by adding dropwise ethylaluminum sesquichloride or the like to a uniform mixture of magnesium ethoxide, tri-n-butoxy monochloroethane and n-butanol, described in JP-A-56-61406 and the like; and an olefin polymerization solid catalyst containing magnesium, a halogen atom, titanium and an electron donor, described in JP-A-2001-139635 and the like.

(ii) Metallocene Catalyst

As an example of the polymerization catalyst suitable for the production of the ethylene-based polymer (A), a metallocene catalyst that is an olefin polymerization catalyst composed of a metallocene-based transition metal compound and a promoter component (see, for example, “Metallocene Shokubai ni-yoru Jisedai Polymer Kogyoka Gijutsu (Next-Generation Polymer Engineering Technology by Metallocene Catalyst) (Volume One and Two); issued by Inter-Research, 1994”) is used, because this catalyst is relatively inexpensive, highly active and excellent in the suitability for polymerization process and furthermore, an ethylene-based polymer having a narrow molecular weight distribution and a narrow copolymerization composition distribution is obtained.

Among others, an olefin polymerization catalyst system containing a so-called metallocene complex and an alumoxane, described in JP-A-60-35007 and the like, and a catalyst system using a promoter component other than alumoxane, described in JP-A-8-34809, JP-A-8-127613, JP-A-11-193306, JP-T-2002-515522 and the like, are suitably used. As the metallocene complex, those where the center metal is Ti, Zr or Hf belonging to Group 4B of the periodic table exhibit high activity for ethylene polymerization and therefore, are suitably used. As for the ligand structure of such a center metal, various structures are known at present and being examined for the polymerization performance such as molecular weight of the produced polyethylene and α-olefin copolymerizability. As described above, the ethylene-based polymer (A) of the present invention preferably has no or a small amount of long-chain branched structure and for the production of an ethylene-based polymer having such a property, a so-called non-bridged complex where a ligand having a conjugated 5-membered ring structure is not bridged with another ligand by a bridging group, is preferred.

According to the structure classification of metallocene compounds by the following formulae [1], [2], [3] and [4] described, for example, in JP-A-11-310612, compounds represented by formulae [1] and [3] are preferred, and a compound represented by formula [1] is more preferred. However, a higher concentration at the polymerization site of ethylene or α-olefin and a shorter polymerization reaction time are supposed to be disadvantageous for the production of a long-chain branched structure and therefore, the propriety of the metallocene compound is of course limited to a relative degree contingent on performing the polymerization under the same conditions. In addition, metallocene complexes described, for example, in JP-A-5-132518, JP-A-2000-154196 and JP-A-2004-161760 are also suitably used. Furthermore, a metallocene complex having a heteroatom-containing monocyclic or polycyclic heteroaromatic group as a substituent on a ligand of a conjugated 5-membered ring structure, described, for example, in JP-T-2002-535339 is also suitably used.

[wherein each of A¹ to A⁴ represents a ligand having a conjugated 5-membered ring structure (A¹ to A⁴ may be the same or different in the same compound), Q¹ represents a bonding group for bridging two conjugated 5-membered ring ligands at arbitrary positions, each of Z¹ and Z² independently represents a ligand containing a nitrogen, oxygen, silicon, phosphorus or sulfur atom bonded to M, a hydrogen atom, a halogen atom or a hydrocarbon group, Q² represents a bonding group for bridging Z² and an arbitrary position of the conjugated 5-membered ring ligand, M represents a metal atom selected from Group 4 of the periodic table, and each of X and Y independently represents a hydrogen atom, a halogen atom, a hydrocarbon group, an alkoxy group, an amino group, a phosphorus-containing hydrocarbon group or a silicon-containing hydrocarbon group, which is bonded to M; their details are as defined in the patent publication above]. (iii) Phillips Catalyst

The Phillips catalyst is a chromium catalyst where a chromium compound is supported on an inorganic oxide support such as silica, silica-alumina and silica-titania and at least a part of chromium elements supported is converted into a hexavalent chromium element by performing activation in a non-reducing atmosphere (see, for example, M. P. McDaniel, Advances in Catalysis, Volume 33, page 47, 1985, Academic Press Inc.; M. P. McDaniel, Handbook of Heterogeneous Catalysis, page 2400, 1997, VCH; M. B. Welch et al., Handbook of Polyolefins: Synthesis and Properties, page 21, 1993, Marcel Dekker). The Phillips catalyst exhibits high activity for ethylene polymerization and therefore, is suitably used. However, since the ethylene-based polymer produced using a Phillips catalyst tends to contain a long-chain branched structure or have a broad molecular weight distribution, its use as the ethylene-based polymer (A) of the present invention requires special care to satisfy the condition (A-3) or (A-4).

(iv) Post-Metallocene Catalyst

As an example of the polymerization catalyst suitable for the production of the ethylene-based polymer (A), a post-metallocene catalyst that is an olefin polymerization catalyst using a homogeneous metal complex (non-metallocene complex) except for the above-described metallocene-based transition metal compound (see, for example, “Polyethylene Gijutsu Dokuhon (Polyethylene Technology Guidebook; issued by Kogyo Chosakai Publishing, 2001”, “Kin'itsu-kei Sen'i Kinzoku Shokubai ni-yoru Living Jugo (Living Polymerization by Homogeneous Transition Metal Catalyst); issued by IPC, 1999”, and “Shokubai Katsuyo Daijiten (Practical Dictionary of Catalysts); issued by Kogyo Chosakai, 2004”) is used, because this catalyst is relatively inexpensive and excellent in the activity and furthermore, an ethylene-based polymer having a narrow molecular weight distribution and a narrow copolymerization composition distribution is obtained.

Among others, suitably used are bisimide, iminoamide and bisamide compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least two N atoms to a transition metal belonging to Groups 3 to 11 of the periodic table through those two N atoms and contains the transition metal disclosed, for example, in JP-T-10-513489, JP-T-2002-521538, JP-T-2000-516295, JP-T-2000-514132, Macromolecules, 1996, page 5241, JACS, 1997, 119, page 3830, JACS, 1999, 121, page 5798, and Organometallics, 1998, page 3155; bis-hydrocarbyloxy and bis-hydrocarbylthio compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least two O or S atoms to a transition metal belonging to Groups 3 to 11 of the periodic table through those two O or S atoms and contains the transition metal, disclosed, for example, in JP-A-6-136048; iminocarboxylate, thiocarboxylate and phosphine carboxylate compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least one N, S or P atom and a carboxyl group (COO) to a transition metal belonging to Groups 3 to 11 of the periodic table through the N, S or P atom and the carboxyl group and contains the transition metal, disclosed, for example, in JP-T-2000-514132, JP-T-2003-535107 and JP-A-2007-77395; β-keto-phosphine, β-keto-imide and β-keto-amide compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least one P or N atom and a carbonyl group (CO) to a transition metal belonging to Groups 3 to 11 of the periodic table through the P or N atom and the carbonyl group and contains the transition metal, disclosed, for example, in JP-T-2004-517933; γ-oxy-phosphine, γ-oxy-imide and γ-oxy-amide compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least one P or N atom and an O atom to a transition metal belonging to Groups 3 to 11 of the periodic table through the P or N atom and the O atom and contains the transition metal, disclosed, for example, in JP-A-64-14217 and JP-T-2004-517933; a γ-sulfonato-phosphine compound of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least one P atom and a sulfonic acid residue (SO³) to a transition metal belonging to Groups 3 to 11 of the periodic table through the P atom and the sulfonic acid residue and contains the transition metal disclosed, for example, in JP-A-6-184214, JP-A-10-195090, JP-T-2002-521534, JP-A-2007-46032 and JP-A-2007-77395; and phenoxyimine and phenoxyamine compounds of a transition metal having a 4- to 8-membered ring chelate structure that is formed by bonding a ligand having at least an N atom and a phenoxy group to a transition metal belonging to Groups 3 to 11 of the periodic table through the N atom and an O atom of the phenoxy group and contains the transition metal disclosed, for example, in JP-A-11-315109, Chemical Communications (2003), (18), 2272-2273.

As such a non-metallocene complex catalyst, those where the center metal is Ti, Zr, Hf, which belong to Group 4B of the periodic table, V, Cr, Fe, Co, Ni or Pd exhibit high activity and are more suitably used, and those where the center metal is Ti. Zr, HEf Fe, Ni or Pd are still more suitably used. However, with some of these post-metallocene catalysts, the ethylene-based polymer produced tends to contain a long-chain branched structure, contain a short-chain branched structure mainly consisting of a methyl branch, or have a broad molecular weight distribution and therefore, its use as the ethylene-based polymer (A) of the present invention requires special care to satisfy the conditions (A-2) to (A-4).

In the present invention, the production of the ethylene-based polymer (A) is preferably performed by contacting ethylene with the olefin polymerization catalyst of (i) to (iv) above, more preferably with (i) a Ziegler catalyst or (ii) a metallocene catalyst, and thereby polymerizing or copolymerizing the ethylene. As the olefin polymerization catalyst, a plurality of kinds may be selected from (i) to (iv) and used. At the time of performing ethylene polymerization or copolymerization, any method, for example, a liquid phase polymerization method such as slurry polymerization, solution polymerization, bulk polymerization in a liquid monomer and suspension polymerization, or a gas phase polymerization can be employed. In the case of a slurry polymerization method, either a slurry polymerization method using a pipe loop-type reactor or a slurry polymerization method using an autoclave-type reactor can be used. The industrial polymerization process is described in detail in Kazuo Matsuura and Naotaka Mikami (compilers), “Polyethylene Gijutsu Dokuhon (Polyethylene Technology Guidebook)”, page 148, 2001, Kogyo Chosakai Publishing. The polymerization method is preferably a slurry polymerization method or a gas phase polymerization method, more preferably a gas phase polymerization method.

The ethylene for use in the present invention may be an ethylene produced from a crude oil derived from a normal fossil raw material or may be a plant-derived ethylene. Also, the polyethylene produced in the present invention can be an ethylene-based polymer producing using a plant-derived ethylene. The plant-derived ethylene and the polyethylene include, for example, ethylene and polymers thereof described in JP-T-2010-511634. The plant-derived ethylene or its polymer has a property of being carbon neutral (not using a fossil raw material and not leading to an increase of carbon dioxide in the air) and can provide an environment-friendly product.

The liquid phase polymerization method is usually performed in a hydrocarbon solvent. As the hydrocarbon solvent, an inert hydrocarbon such as propane, n-butane, isobutane, n-pentane, isopentane, hexane, heptane, octane, decane, cyclohexane, benzene, toluene and xylene is used individually or as a mixture, or a liquid monomer is used. As the gas phase polymerization method, a commonly known polymerization method using a fluidized bed, a stirring bed or the like in the co-presence of an inert gas may be employed, and depending on the case, a so-called condensing mode in which a medium for removing the polymerization heat is allowed to coexist can be also employed.

The polymerization temperature is generally from 0 to 300° C., practically from 50 to 270° C., and although this may vary depending on the polymerization process employed, preferably, the polymerization temperature is from 60 to 110° C. in the slurry polymerization or suspension polymerization, from 100 to 250° C. in the solution polymerization or bulk polymerization in liquid ethylene, and from 60 to 100° C. in the gas phase polymerization method. The catalyst concentration and olefin concentration in the reactor may be an arbitrary concentration high enough for allowing the polymerization to proceed. The ethylene concentration may be from about 1 to about 10% based on the weight of the contents of the reactor in the case of slurry polymerization, suspension polymerization and solution polymerization, and in the case of gas phase polymerization, the concentration may be from 0.1 to 10 MPa in terms of the total pressure. The polymerization may be also performed by causing hydrogen to be present together, and this is commonly practiced as a method for adjusting MFR of the ethylene-based polymer (A). Hydrogen has an effect as a so-called chain transfer agent for adjusting the molecular weight in general. MFR can be adjusted to a certain extent by changing the polymerization conditions such as polymerization temperature and molar ratio of the catalyst. In order reduce the amount of the long-chain branch of the ethylene-based polymer (A), the ethylene concentration or hydrogen concentration is preferably higher.

As for the polymerization method, not only single-stage polymerization of producing an olefin-based polymer by using one reactor but also multi-stage polymerization using at least two reactors connected in series and/or in parallel for increasing the production amount or more precisely controlling the molecular weight distribution or comonomer composition distribution, can be performed. In the case of multi-stage polymerization, series multi-stage polymerization where a plurality of reactors are connected and a reaction mixture obtained by polymerization in a first-stage reactor is continuously fed in sequence to reactors of second and following stages is preferred. In the series multi-stage polymerization method, a polymerization reaction mixture in the reactor of a precedent stage is continuously discharged and transferred through a connecting pipe to reactors of subsequent and later stages. Also, the polymerization can be performed even when a so-called scavenger as a component for water removal is added to the polymerization system. As the scavenger, an organoaluminum compound such as trimethylaluminum, triethylaluminum and triisobutylaluminum, the above-described organoaluminum oxy compound, an organozinc compound, or an organomagnesium compound may be used, but an organoaluminum compound is most commonly used.

(2) Ethylene-Based Polymer (B)

The compound (B) that is one of components constituting the polyethylene-based resin composition of the present invention satisfies all of the conditions (B-1) to (B-6) described below.

2-1. Condition (B-1)

The melt flow rate (MFR_(B)) of the component (B) in the present invention is from 0.01 to 1.5 g/10 min, preferably from 0.05 to 1.0 g/10 min, more preferably from 0.1 to 0.8 g/10 min.

If MFR_(B) is less than 0.01 g/10 min, the polyethylene-based resin composition may be inferior in the moldability, particularly in the melt flowability and spreadability, and furthermore, uniform mixing with the ethylene-based polymer (A) may be difficult, disadvantageously giving rise to production of an appearance failure such as gel, grain and fisheye or reduction in the impact strength or transparency. If MFR_(B) exceeds 1.5 g/10 min, the effect that the polyethylene-based resin composition or its molded product may be enhanced in the mechanical strength such as impact strength, tear strength and tensile strength as well as in the transparency may not be sufficiently exerted, and this is not preferred. In relation to MFR_(A), MFR_(B) must further satisfy 100>MFR_(A)/MFR_(B)>1.0 so that the polyethylene-based resin composition of the present invention or its molded product can be enhanced in the mechanical strength such as impact strength, tear strength and tensile strength and in the transparency, and it is necessary to satisfy preferably 20>MFR_(A)/MFR_(B)>1.1, more preferably 15>MFR_(A)/MFR_(B)>1.2, still more preferably 10>MFR_(A)/MFR_(B)>2.0. Incidentally, MFR_(B) indicates a value when measured under the same conditions as in the condition (A-1).

2-2. Condition (B-2)

The density_(B) of the component (B) in the present invention is from 0.880 to 0.940 g/cm³, preferably from 0.891 to 0.940 g/cm³, more preferably from 0.895 to 0.925 g/cm³, still more preferably from 0.900 to 0.915 g/cm³, yet still more preferably from 0.900 to 0.910 g/cm³.

When the density_(B) is in this range, the polyethylene-based resin composition or its molded product is excellent in the balance between impact strength and stiffness and in the transparency. On the other hand, if the density_(B) is less than 0.880 g/cm³, the stiffness is reduced and when the product is a molded product having a small thickness, such as film and sheet, as well as various problems in using the product, a problem is disadvantageously brought about in the step of winding up the product or the post-processing step such as surface printing⋅lamination or when the product is a molded product having a large wall thickness, such as pipe and various containers, since the product is too soft and undergoes deformation, the wall thickness must be disadvantageously designed to be larger than necessary. In addition, the polymer is heavily sticky even at room temperature and difficult to handle in the blending step with the ethylene-based polymer (A), disadvantageously giving rise to product sticking of the polyethylene-based resin composition, and furthermore, the compatibility with the ethylene-based polymer (A) may be reduced to deteriorate the impact strength or transparency due to phase separation. Also, if the density_(B) exceeds 0.940 g/cm³, the impact strength or transparency is deteriorated and this is not preferred.

In relation to the density_(A), the density_(B) preferably satisfies 1.070>density_(A)/density_(B)>0.990 so that the polyethylene-based resin composition of the present invention or its molded product can be enhanced in the mechanical strength such as impact strength, tear strength and tensile strength and in the transparency, and it is necessary to satisfy more preferably 1.059>density_(A)/density_(B)>1.000, still more preferably 1.050>density_(A)/density_(B)>1.005, yet still more preferably 1.035>density_(A)/density_(B)>1.010. Incidentally, density_(B) indicates a value when measured under the same conditions as in the condition (A-2).

2-3. Condition (B-3)

The ratio ([Mw/Mn]_(B)) between weight average molecular weight (Mw) and number average molecular weight (Mn) of the component (B) in the present invention is from 2.0 to 10.0, preferably from 2.0 to 6.0, more preferably from 2.5 to 5.6, still more preferably from 2.9 to 4.5, yet still more preferably from 3.2 to 4.0.

If [Mw/Mn]_(B) is less than 2.0, the polymer may be difficult to mix with the ethylene-based polymer (A) and therefore, this should be avoided. If [Mw/Mn]_(B) exceeds 10.0, the effect of improving the impact strength of the polyethylene-based resin composition or its molded product may be insufficient or deterioration of the transparency or susceptibility to sticking may result, and this is not preferred. Incidentally, [Mw/Mn]_(B) indicates a value when measured under the same conditions as in the condition (A-3).

2-4. Condition (B-4)

The degree of strain hardening [λmax(2.0)]_(B) of the component (B) in the present invention is from 1.2 to 20.0, preferably from 1.2 to 10.0, more preferably from 1.7 to 8.0, still more preferably from 2.4 to 6.0, yet still more preferably 3.0 to 5.0.

If [λmax(2.0)]_(B) is less than 1.2, the ethylene-based polymer, polyethylene-based resin composition or its molded product may lack the flowability or melt tension and be deteriorated in the molding characteristics. If [λmax(2.0)]_(B) exceeds 20.0, the flowability and melt tension may be excellent, but the polyethylene-based resin composition or its molded product may be disadvantageously reduced in the impact strength or transparency. Incidentally, [λmax(2.0)]_(B) indicates a value when measured under the same conditions as in the condition (A-4). Furthermore, as to the relationship of [λmax(2.0)]_(B) and [λmax(2.0)]_(A), when the ratio therebetween satisfies 20>[λmax(2.0)]_(B)/[λmax(2.0)]_(A)>1.0, the polyethylene-based resin composition of the present invention enhanced particularly in the balance between moldability and mechanical property, and this is preferred. If the ratio above is 20 or more, the moldability of the resin composition may be improved, but disadvantageously, the mechanical strength or transparency may be reduced, or uniform mixing of the ethylene-based polymer (A) and the ethylene-based polymer (B) may be difficult, leading to deterioration of the outer appearance. Also, if the ratio is 1.0 or less, the improvement of moldability of the resin composition may not be sufficiently exerted, and this is not preferred. The ratio is preferably 10>[λmax(2.0)]_(B)/[λmax(2.0)]_(A)>1.1, more preferably 5.0>[λmax(2.0)]_(B)/[λmax(2.0)]_(A)>1.5, still more preferably 4.0>[λmax(2.0)]_(B)/[λmax(2.0)]_(A)>1.8.

The effect of the elongational flow characteristics of the polyethylene on its moldability or mechanical properties of the molded product is as already described in general terms in the condition (A-4). As a result of intensive studies on a polyethylene-based resin composition with an attempt to improve the molding process bound up with the elongational flow characteristics of a polyethylene and overcome the problem in mechanical properties of a molded product by designing the long-chain branched structure as a main factor governing the elongational viscosity characteristics, it has been found that when an ethylene-based polymer (A) having a small amount of long-chain branched structure is used as a high MFR main component of the resin composition, that is, as a main component on the low molecular weight side and an ethylene-based polymer (B) having a large amount of long-chain branched structure represented by the degree of elongational strain hardening [λmax(2.0)]_(B) defined in the condition (B-4) is used as a low MFR main component of the resin composition, that is, as a main component on the high molecular weight side, it has been found that as well as enhancement of the molding characteristics, the polyethylene resin composition is excellent in the mechanical properties, particularly stiffness and impact strength, and furthermore, excellent in the transparency. In addition, when the long-chain branched structure of the ethylene-based polymer (B) has characteristics represented by the following condition (B-5) where the strain rate dependency of the degree of elongational strain hardening is different from that used conventionally, it has been found that the improving effect is very excellent in all of molding characteristics, mechanical properties and transparency of the polyethylene-based resin composition.

2-5. Condition (B-5)

As regards the component (B) in the present invention, the ratio [λmax(2.0)]_(B)/[λmax(0.1)]_(B) of [λmax(2.0)]_(B) defined in the condition (B-4) and [λmax(0.1)]_(B) measured similarly by setting the elongational strain rate to 0.1 (unit: 1/sec) is from 1.2 to 10.0, preferably from 1.3 to 5.0, more preferably from 1.4 to 4.0, still more preferably from 1.5 to 3.0.

If [λmax(2.0)]_(B)/[λmax(0.1)]_(B) is less than 1.2, non-uniform molten state of the ethylene-based polymer, polyethylene-based resin composition or its molded product or thermally unstable structure may result or reduction in the impact strength or deterioration of the transparency may be caused due to strength anisotropy that is attributable to the presence of a significantly elongated long-chain branched structure, and this is not preferred. If [λmax(2.0)]_(B)/[λmax(0.1)]_(B) exceeds 10.0, the melt tension and flowability during molding may be excellent, but the polyethylene-based resin composition or its molded product may be disadvantageously reduced in the impact strength or transparency.

2-6. Condition (B-6)

The component (B) in the present invention is a polymer produced by a polymerization reaction using a transition metal-containing catalyst, preferably a polymer produced by an ethylene polymerization reaction using a transition metal-containing catalyst described in detail later in 2-10. Production Method of Ethylene-Based Polymer (B) or in [V] Production Method of Ethylene-Based Polymer of the present invention, more preferably a polymer produced by a coordination anionic polymerization reaction of ethylene using a transition metal-containing catalyst.

At present, various radical polymerization initiators are well known as the ethylene polymerization catalyst not containing a transition metal, and specific examples thereof include a peroxide such as dialkyl peroxide compound, alkyl hydroperoxide compound, benzoyl peroxide and hydrogen peroxide, and an azo compound such as azobisisobutyronitrile and azobiscyclohexanecarbonitrile. An ethylene-based polymer produced by a radial polymerization reaction using such a radical polymerization initiator contains a large amount of long-chain branched structure and when used as a component of a polyethylene-based resin composition, the polymer may exert an effect of enhancing the molding characteristics or transparency, but the amount of long-chain branched structure becomes too large to disadvantageously reduce the strength of the composition or its molded product. In addition, realization of enough reducing of the MFR and the density of the ethylene-based polymer (B) or copolymerizing with a preferred α-olefin may be impossible and in turn, the strength of the composition or its molded product cannot be sufficiently increased, which is not preferred. Incidentally, even if the catalyst contains a transition metal, when the polymerization reaction proceeds substantially by radical polymerization as in a so-called redox system such as hydrogen peroxide/ferrous chloride or cerium salt/alcohol, the catalyst is not regarded as the transition metal-containing catalyst of the present invention.

2-7. Condition (B-7)

As regards the component (B) in the present invention, in addition to the conditions (B-1) to (B-6), furthermore, the branching index (g_(C)′) at a molecular weight of 1,000,000 as measured by a GPC measurement instrument with a differential refractometer, a viscosity detector and a light scattering detector is preferably from 0.30 to 0.70. The g_(C)′ value is more preferably from 0.30 to 0.59, still more preferably from 0.35 to 0.55, yet still more preferably from 0.35 to 0.50. If the g_(C)′ value exceeds 0.70, the moldability of the polyethylene-based resin composition may be insufficient, or the resin composition or its molded product may lack the transparency, and this is not preferred. If the g_(C)′ value is less than 0.30, the moldability of the polyethylene-based resin composition may be improved, but reduction of the impact strength of the molded product or deterioration of the transparency may disadvantageously result. Incidentally, in the present invention, the g_(C)′ value of the ethylene-based polymer or the W_(C) value in the next paragraph is an evaluation technique for the amount of long-chain branch, using the molecular weight distribution curve or branching index (g′) calculated from the GPC-VIS measurement described below.

2-8. Condition (B-8)

As regards the component (B) in the present invention, in addition to the conditions (B-1) to (B-7), furthermore, the content (W_(C)) of components having a molecular weight of 1,000,000 or more as measured by a GPC measurement instrument with a differential refractometer, a viscosity detector and a light scattering detector is preferably from 0.01 to 30.0%. The W_(C) value is more preferably from 0.01 to 10.0%, still more preferably from 0.02 to 8.0%, yet still more preferably from 0.05 to 6.0%, and most preferably from 0.09 to 4.0%.

If the W_(C) value is less than 0.01%, the polyethylene-based resin composition may be inferior in the moldability or the resin composition or its molded product may lack the transparency, and this is not preferred. If the W_(C) value exceeds 30.0%, the polyethylene-based resin composition may be enhanced in the melt tension out of the moldability, but the melt flowability may be excessively reduced to disadvantageously cause a problem in the production or molding of the resin composition. Furthermore, the impact strength or the transparency of the molded product may be deteriorated, and this is not preferred.

[Branched Structure Analysis by GPC-VIS]

As the GPC instrument having a differential refractometer (RI) and a viscosity detector (Viscometer), Alliance GPC V2000 manufactured by Waters was used. Also, as the light scattering detector, a multi-angle laser light scattering photometer (MALLS), DAWN-E, manufactured by Wyatt Technology was used. The detectors were connected in order of MALLS, RI and Viscometer. The mobile phase solvent was 1,2,4-trichlorobenzene (Irganox 1076 as an antioxidant was added at a concentration of 0.5 mg/mL). The flow rate was 1 mL/min. Two columns of GMHHR-H(S) HT manufactured by Tosoh Corporation were connected and used. The temperature of each of detectors in the column and the sample injection part was 140° C. The sample concentration was set to 1 mg/mL. The injection amount (sample loop volume) was 0.2175 mL. In determining the absolute molecular weight (M) obtained from MALLS, the square radius of gyration (Rg) and the intrinsic viscosity ([η]) obtained from Viscometer, the data processing software ASTRA (version 4.73.04) attached to MALLS was utilized, and computation was performed by referring to the following literatures.

REFERENCE LITERATURES

1. Developments in polymer characterization. vol. 4. Essex: Applied Science; 1984. Chapter 1.

2. Polymer, 45, 6495-6505 (2004)

3. Macromolecules, 33, 2424-2436 (2000)

4. Macromolecules, 33, 6945-6952 (2000)

[Calculation of Branching Index (g_(C)′), etc.]

The branching index (g′) is calculated as a ratio (ηbranch/ηlin) between the intrinsic viscosity (ηbranch) obtained by measuring the sample by Viscometer and the intrinsic viscosity (ηlin) obtained by separately measuring a linear polymer.

When a long-chain branch is introduced into a polymer molecule, the radius of gyration becomes small as compared with a molecule of a linear polymer having the same molecular weight, and when the radius of gyration becomes small, the intrinsic viscosity decreases. Therefore, along with introduction of a long-chain branch, the ratio (ηbranch/ηlin) of the intrinsic viscosity (ηbranch) of a branched polymer to the intrinsic viscosity (ηlin) of a linear polymer having the same molecular weight becomes small. Accordingly, it is meant that when the branching index (g′=ηbranch/ηlin) takes a value smaller than 1, a branch is introduced and as the value becomes smaller, the amount of long-chain branch introduced is increased. Particularly, in the present invention, the content percentage (%) of components having a molecular weight of 1,000,000 or more in terms of the absolute molecular weight obtained from MALLS to the amount of all components measured by RI is calculated as the content (W_(C)) of components having a molecular weight of 1,000,000 or more, and the above-described g′ at a molecular weight of 1,000,000 in terms of the absolute molecular weight obtained from MALLS is calculated as g_(C)′.

FIGS. 4A and 4B shown an example of the analysis results by GPC-VIS above. FIG. 4A shows a molecular weight distribution curve measured based on the molecular weight (M) obtained from MALLS and the concentration obtained from RI, and FIG. 4B shows a branching index (g′) at the molecular weight (M). Here, as the linear polymer, a linear polyethylene, Standard Reference Material 1475a (National Institute of Standards & Technology), was used.

2-9. Composition of Ethylene-Based Polymer (B)

As for the composition of the component (B) in the present invention, the description in 1-5. Composition of Ethylene-Based Polymer (A) above can apply as-is except for the ratio between ethylene and α-olefin, and with respect to the same portions, description is omitted.

The ethylene-based polymer (B) of the present invention is preferably a copolymer of ethylene and the α-olefin described above in 1-5. and most preferably a copolymer with hexene-1 and octene-1. The ratio of ethylene and the α-olefin in the ethylene-based polymer (B) of the present invention is from about 75 to 99.5 wt % of ethylene and from about 0.5 to 25 wt % of α-olefin, preferably from about 78 to 97 wt % of ethylene and from about 3 to 22 wt % of α-olefin, more preferably from about 80 to 96 wt % of ethylene and from about 4 to 20 wt % of α-olefin, still more preferably from about 82 to 95 wt % of ethylene and from about 5 to 18 wt % of α-olefin. When the ethylene content is in this range, the polyethylene-based resin composition or its molded product has good balance between stiffness and impact strength and is excellent also in the transparency. In the case of using the above-described dienes, the dienes must be of course used in the range where the long-chain branched structure satisfies the conditions (B-4) and (B-5).

2-10. Production Method of Ethylene-Based Polymer (B)

As for the production method of the ethylene-based polymer (B) in the present invention, the description in 1-6. Production Method of Ethylene-Based Polymer (A) above can apply as-is except that selection of an olefin polymerization catalyst appropriate to provide for a long-chain branched structure corresponding to the conditions (B-4) and (B-5) to the ethylene-based polymer (B) must be taken care of, and with respect to the same portions, description is omitted.

The transition metal-containing olefin polymerization catalyst suitable for the production of the ethylene-based polymer (B) in the present invention and satisfying the profitability at the industrial level is, similarly to the ethylene-based polymer(A), appropriately selected from the above-described (i) Ziegler catalyst, (ii) metallocene catalyst, (iii) Phillips catalyst and (iv) post-metallocene catalyst and used.

The catalyst used for the production of the ethylene-based polymer (B) in the present invention is more suitably (i) a Ziegler catalyst, (ii) a metallocene catalyst or (iv) a post-metallocene catalyst, still more suitably (i) a Ziegler catalyst or (ii) a metallocene catalyst. Among others, (ii) a metallocene catalyst produces an ethylene-based polymer having a narrow molecular weight distribution or a narrow copolymerization composition distribution as compared with other catalysts and therefore, is preferred from the standpoint of enhancing the mechanical properties, transparency, anti-sticking performance, heat seal performance and the like of the polyethylene-based resin composition or its molded product. Of course, in the case of selecting (iv) a post-metallocene catalyst capable of exerting the same performances from the standpoint above, use of the catalyst is preferred.

Out of the characteristics which the ethylene-based polymer (B) in the present invention must satisfy, the particularly important characteristics represented by the condition (B-4) and the condition (B-5). preferably the condition (B-4), the condition (B-5) and the condition (B-7), are considered to be attributable to a characteristic long-chain branched structure that is understood to contain a fairly large amount of a shortish branch structure sufficiently developed to an extent of enabling branches to intertwine with each other at a level where an elongational strain hardening behavior is observed.

In general, an ethylene-based polymer having a long-chain branch is an ethylene-based polymer having a long branching structure (long-chain branch) in the polyethylene molecule and is contrasted with an ethylene homopolymer or ethylene⋅α-olefin copolymer having a normal short-chain branch (sometimes referred to as straight chain polyethylene). For producing such an ethylene-based polymer having a long-chain branch, various methods have been heretofore attempted, and examples thereof include a method of directly copolymerizing ethylene and an α-olefin by using a recent Ziegler catalyst or metallocene catalyst, and a method of copolymerizing ethylene and a previously produced macromonomer to introduce a long-chain branch. Also, an ethylene-based polymer producing using a catalyst called a Phillips catalyst where the center metal is a hexavalent chromium element, is supposed to contain a small amount of a long-chain branched structure. As for the literature specifically describing the production of an ethylene-based polymer having a long-chain branched structure, the method using a recent Ziegler catalyst is described, for example, in JP-A-60-090203 and JP-10-298234. In these methods, the long-chain branched structure of the ethylene-based polymer can be adjusted by appropriately selecting the kind and amount of the organoaluminum compound, the kind of the catalyst or the polymerization conditions so as to control the quality and amount of the long-chain branch. As for the production using a metallocene-based catalyst, the method using a complex having a bridged biscyclopentadienyl ligand is described, for example, in JP-A-2002-544296 and JP-A-2005-507961; the method using a complex having an indenyl ligand is described, for example, in JP-A-2-276807, JP-A-2002-308933, JP-A-2004-292772, JP-A-8-311121, JP-A-8-311260 and JP-A-8-48711; the method using a catalyst obtained by combining a non-MAO-modified particle with a complex having a bridged bisindenyl ligand is described, for example, in JP-A-2004-292772; the method using a constrained geometry complex catalyst is described, for example, in JP-A-6-306121; and the method using a combination of a benzindenyl ligand-containing complex with another low-molecular-weight polyethylene-producing complex is described, for example, in JP-A-2006-2098.

In these methods, the quality and amount of the long-chain branch can be controlled by appropriately selecting the kind of the complex, the catalyst preparation conditions or the polymerization conditions. Also, a method of introducing a long-chain branch into a polyethylene chain by using dienes as a comonomer and copolymerizing it with ethylene is disclosed, for example, in JP-A-10-512600, and a method of introducing a long-chain branch into a polyethylene chain by utilizing a chain transfer reagent as T-reagent is disclosed, for example, in JP-T-2008-505222. In these methods, the quality and amount of the long-chain branch can be controlled by controlling the kind or amount of the dienes or chain transfer agent or appropriately selecting the kind of the catalyst or the polymerization conditions. Furthermore, a method where a macromonomer is previously produced by using a specific metallocene-based catalyst and then the macromonomer is copolymerized with ethylene, thereby introducing a long-chain branch into a polyethylene chain, is disclosed, for example, in JP-A-7-252311, JP-A-8-502303, International Publication No. 95-11931, JP-T-2001-511215 and JP-A-2006-321991. In these methods, the quality and amount of the long-chain branch can be controlled by appropriately selecting the kind of the complex, the catalyst preparation conditions, the polymerization conditions, or the amount or molecular weight of the macromonomer. The index indicative of such an ethylene-based polymer having a long-chain branch is generally expressed by various measurement techniques and the like, for example, by the melt flow rate ratio (MFR ratio; see, for example, Japanese Patent 2,571,280), the melt tension (MT; see, for example. Japanese Patent 3,425,719), the presence or absence of rising of elongational viscosity (strain hardening) (see, for example, Japanese Patent 4,190,638), and the activation energy (see, for example, JP-A-7-062031). The resin that is commercially available in practice includes, for example, trade name: AFFINITY (registered trademark) FM1570 (produced by Dow Chemical), and trade name: Excellen GMH (registered trademark) (produced by Sumitomo Chemical Co., Ltd.).

However, not all of ethylene-based polymers having a long-chain branched structure produce by these methods are suited for the ethylene-based polymer (B) as a constituent component of the polyethylene-based resin composition of the present invention. The present inventors have found that selection of the specific ethylene-based polymer (B) leads to greatly different results in the molding characteristics, mechanical strength and transparency of the polyethylene-based composition or a molded product of the composition, and in addition to the selection of a long-chain branched structure suitable for the present invention, only when an ethylene-based polymer (B) of which MFR, density and molecular weight distribution conditions are suitably designed as described above is used as a constituent component of the polyethylene-based composition, the present invention has been accomplished.

The ethylene-based polymer having a long-chain branched structure, which can be produced by the conventional technique, includes, as described above, a polymer produced using a Ziegler catalyst, a polymer produced using a complex having a bridged biscyclopentadienyl ligand, a polymer produced using a bridged bisindenyl ligand, a polymer produced using a catalyst obtained by combining a bridged bisindenyl ligand-containing complex with a non-MAO-modified particle, a polymer produced using a constrained geometry complex catalyst, a polymer produced using a combination of a benzindenyl ligand-containing complex with another low-molecular-weight polyethylene-producing complex, a polymer in which a long-chain branch is introduced into a polyethylene chain by using dienes as a comonomer and copolymerizing it with ethylene, a polymer in which a long-chain branch is introduced into a polyethylene chain by utilizing a chain transfer reagent as T-reagent, and a polymer produced by a method where a macromonomer is previously produced by using a specific metallocene-based catalyst and then the macromonomer is copolymerized with ethylene, thereby introducing a long-chain branch into a polyethylene chain.

However, when the ethylene-based copolymer produced using a Ziegler catalyst is used as the ethylene-based polymer (B) in the present invention, the molecular weight distribution or copolymerization composition distribution may be broadened to make the polyethylene-based resin composition or its molded product be insufficient in the impact strength or transparency, or the polymer may be heavily sticky due to a large amount of low crystalline components, and therefore, this is not preferred. In addition, with the catalyst above, only a small amount of an elongated long-chain branched structure can be produced, failing in sufficiently enhancing the impact strength or transparency. When an ethylene-based copolymer produced using a bridged biscyclopentadienyl ligand-containing complex or a bridged bisindenyl ligand-containing complex is used, the molecular weight distribution tends to be broadened, making the polyethylene-based resin composition or its molded product be insufficient in the impact strength or transparency, or the chain length of the long-chain branch tends to become long, failing in sufficiently enhancing the impact resistance or transparency. When an ethylene-based copolymer produced using a catalyst obtained by combining a bridged bisindenyl ligand-containing complex with a non-MAO-modified particle is used, the molecular weight distribution tends to be more broadened than in the case of using an MAO promoter and in turn, the polyethylene-based resin composition or its molded product may be insufficient in the impact strength or transparency. For example, Excellen GMH that is a commercial product produced using the catalyst above in practice has a wide molecular weight distribution and an elongated long-chain branch and lacks in the number of branches, as a result, the effect of improving the moldability may be low or the impact strength or transparency may not be sufficiently enhanced. When an ethylene-based copolymer produced using a constrained geometry complex catalyst is used, for example, AFFINITY (for example, FM1570) that is a commercial product produced using the catalyst above in practice has a long chain length of the long-chain branch and lacks in the number of branches, as a result, the effect of improving the moldability may be low or the impact strength or transparency may not be sufficiently enhanced. As the case now stands, none of these methods are preferred as the production method of the ethylene-based polymer (B) in the present invention.

The ethylene-based copolymer produced using a combination of a benzindenyl ligand-containing complex with another low-molecular-weight polyethylene-producing complex is thought to have some possibility of realizing a long-chain branched structure required of the ethylene-based polymer (B) in the present invention, but for the production of a long-chain branched structure, the polymerization conditions may be limited to a low hydrogen concentration, the catalyst conditions such as proportion of a complex used or the polymerization conditions must be further studied so as to avoid broadening of the molecular weight, or studies on the setting of MFR or density of the ethylene-based polymer (B) or the ethylene-based polymer (A) combined are required. Furthermore, in order to realize a long-chain branched structure appropriate as the ethylene-based polymer (B) in the present invention by the method of copolymerizing dienes or the method utilizing a chain transfer reagent, the kind of the dienes, chain transfer agent or polymerization catalyst used or the polymerization conditions must be further studied. In addition, it is considered that problems such as contamination (odor, coloring, deterioration) of the polymer by the residual diene or residual chain transfer agent must be solved. Also, in order to realize a long-chain branched structure appropriate as the ethylene-based polymer (B) in the present invention by the method of producing a macromonomer and copolymerizing it with ethylene to thereby introduce a long-chain branch into the polyethylene chain, for example, the kind of the polymerization catalyst used, the polymerization conditions, and the control of molecular weight, density and copolymerization ratio of the produced macromer must be further studied and in addition, since a residual macromer remains as a low-molecular-weight polymer in the polymer or in the polyethylene-based resin composition containing the polymer as one component, the molecular weight distribution or the copolymerization composition distribution tends to be broadened, leaving high possibility that the impact strength or transparency of the polyethylene-based resin composition or its molded product becomes insufficient, which reveals that the polymer is not preferred enough. For these reasons, the ethylene-based polymer (B) tends to have a longish chain length of the long-chain branch and in turn, the impact strength and transparency may not be sufficiently enhanced. Also, it is considered that problems such as contamination (odor, coloring, deterioration) of the polymer must be solved.

That is, as a result of intensive studies to attain the object of the present invention, with respect to the olefin polymerization catalyst capable of producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention, the present inventors have reached, as an example, a method where a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like that has been discovered recently is used as an essential catalyst component (for example, JP-A-2011-137146 and [V] Production Method of Ethylene-Based Polymer of the Present Invention in this description); as another example, a method where a complex having a benzindenyl ligand or the like is used as a catalyst component (for example, JP-A-2006-2098); and, as still another example, a method where a catalyst using a mixture of a metallocene complex, i.e., a complex having a bridged bis(indenyl) ligand, a bridged bis(azulenyl) ligand or a bridged bis(cyclopentadienyl) ligand, and a borane or borate compound as a compound for producing a cationic metallocene compound together with an organoaluminum oxy compound, is used.

The olefin polymerization catalyst containing, as an essential component, a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like capable of producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention contains the following component (a-1) and component (b) and, if desired, further contains the component (c):

component (a-1): a metallocene compound represented by formula (a-1-1),

component (b): a compound capable of reacting with the metallocene compound of the component (a-1) to produce a cationic metallocene compound, and

component (c): a microparticle support.

i) Component (a-1)

The component (a-1) is a metallocene compound represented by the following formula (a-1-1):

[in formula (a-1-1), M represents any one transition metal of Ti, Zr and Hf; each of X¹ and X² independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q¹ and Q² independently represents a carbon atom, a silicon atom or a germanium atom; each R¹ independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R¹ may combine to form a ring together with Q¹ and Q²; m is 0 or 1 and when m is 0, Q¹ is bonded directly to the conjugated 5-membered ring including R² and R³; each R² independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20 and even when the plurality of R² are a hydrocarbon group or the like, unlike R⁴, these R² do not form a ring together with the carbon atoms to which R² are bonded; R³ represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R³ is bonded; R⁴ is an atom or a group bonded to a carbon atom of R³ and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; n represents an integer of 0 to 10 and when n is 2 or more, at least two R⁴ may form a ring together with the carbon atoms to which R⁴ are bonded; and each R⁵ independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen atom-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20 and even when the plurality of R⁵ are a hydrocarbon group or the like, unlike R⁴, these R⁵ do not form a ring together with the carbon atoms to which R⁵ are bonded].

In formula (a-1-1), M of the metallocene compound represents Ti, Zr or Hf. M is preferably Zr or Hf and from the standpoint that the polymerization activity is high, M is more preferably Zr. In the present invention, this preference order of center metal species applies in all descriptions of metallocene complexes below.

Each of X¹ and X² independently includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an i-propoxymethyl group, an n-butoxymethyl group, an i-butoxymethyl group, a tert-butoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an acetyl group, a 1-oxopropyl group, a 1-oxo-n-butyl group, a 2-methyl-1-oxopropyl group, a 2,2-dimethyl-1-oxo-propyl group, a phenylacetyl group, a diphenylacetyl group, a benzoyl group, a 2-methoxyphenyl group, a 3-methoxyphenyl group, a 4-methoxyphenyl group, a 2-furyl group, a 2-tetrahydrofuryl group, a dimethylaminomethyl group, a diethylaminomethyl group, a di-i-propylaminomethyl group, a bis(dimethylamino)methyl group, a bis(di-i-propylamino)methyl group, a (dimethylamino)(phenyl)methyl group, a methylimino group, an ethylimino group, a 1-(methylimino)ethyl group, a 1-(phenylimino)ethyl group, a 1-[(phenylmethyl)imino]ethyl group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, a phenoxy group, a dimethylamino group, a diethylamino group, a di-n-propylamino group, a di-i-propylamino group, a di-n-butylamino group, a di-i-butylamino group, a di-tert-butylamino group, and a diphenylamino group.

Specific preferred examples of X¹ and X² include a chlorine atom, a bromine atom, a methyl group, an n-butyl group, an i-butyl group, a methoxy group, an ethoxy group, an i-propoxy group, an n-butoxy group, a phenoxy group, a dimethylamino group, and a di-i-propylamino group. Among these specific examples, a chlorine atom, a methyl group and a dimethylamino group are more preferred.

Each of Q¹ and Q² independently represents a carbon atom, a silicon atom or a germanium atom and is preferably a carbon atom or a silicon atom.

Each R¹ independently includes, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, and a phenyl group. In the case where R¹ forms a ring together with Q¹ and Q², examples include a cyclobutylidene group, a cyclopentylidene group, a cyclohexylidene group, a silacyclobutyl group, a silacyclopentyl group, and a silacyclohexyl group.

When Q¹ or/and Q² are a carbon atom, specific preferred examples of R¹ include a hydrogen atom, a methyl group, an ethyl group, a phenyl group and a cyclobutylidene group, and when Q¹ or/and Q² are a silicon atom, specific preferred examples include a methyl group, an ethyl group, a phenyl group and a silacyclobutyl group.

Each R² independently includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

Out of two R², at least one is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, because the polymerization activity becomes high in particular. Also, R² on the 2-position is preferably a hydrogen atom, because the characteristics of the long-chain branched structure are particularly improved and in turn, the moldability is excellent.

Specific preferred examples of R², each independently, include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a 2-methylfuryl group, and a trimethylsilyl group.

Among these specific examples, a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are more preferred, and a hydrogen atom, a methyl group and a phenyl group are still more preferred.

Specific examples of the condensed cyclopentadienyl structure formed by R³ and a cyclopentadienyl moiety to which R³ is bonded, include the following partial structures (I) to (VI).

Among these specific examples, (I), (III) and (VI) are preferred. Also, R⁴ may be substituted on these partial structures (I) to (VI).

The substituent R⁴ includes, in addition to a hydrogen atom, for example, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-tert-butylphenyl group, a 3,5-dimethylphenyl group, a 3,5-di-tert-butylphenyl group, a naphthyl group, an anthracenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 2,6-dichloro-4-trimethylsilylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

In the case where two or more R⁴ form a ring together with the carbon atoms to which R⁴ are bonded, examples include a benz[e]indenyl group, a benz[f]indenyl group, a 6,7-dihydroindacenyl group, a 5,5,7,7-tetramethyl-6,7-dihydroindacenyl group, a 5,6,7,8-tetrahydro-benz[f]indenyl group, and a 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-benz[f]indenyl group.

Specific preferred examples of R⁴ include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a naphthyl group, and a trimethylsilyl group.

Each R⁵ independently includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

Out of four R⁵, at least one is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, because the polymerization activity is particularly increased. Also, R⁵ on the 2-position and 5-position are preferably a hydrogen atom, because the characteristics of the long-chain branched structure are particularly improved and in turn, the moldability is excellent.

Specific preferred examples of R⁵ include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a 2-methylfuryl group, and a trimethylsilyl group.

Among these specific examples, a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are more preferred, and a hydrogen atom, a methyl group, a tert-butyl group and a phenyl group are still more preferred.

In formula (a-1-i), m is 0 or 1 and when m is 0, Q¹ is bonded directly to the conjugated 5-membered ring including R² and R³. Furthermore, n represents an integer of 0 to 10 and when n is 2 or more, at least two R⁴ may form a ring together with the carbon atoms to which R⁴ are bonded.

The metallocene compound of the component (a-1) is preferably a compound represented by the following formula (a-1-2), more preferably a compound represented by the following formula (a-1-3):

In the metallocene compounds represented by formulae (a-1-2) and (a-1-3), for X¹, X², Q, R¹, R², R⁴ and R⁵, the same structures as the atoms and groups described in the metallocene compound represented by formula (a-1-1) may be selected.

Specific examples of the metallocene compound of the component (a-1) are shown in Tables a-1 to a-4 below, but the present invention is not limited thereto. In Tables a-1 to a-4, Cp stands for a cyclopentadienyl group, Ind stands for an indenyl group, Me stands for a methyl group, Ph stands for a phenyl group, Et stands for an ethyl group, nPr stands for an n-propyl group, nBu stands for an n-butyl group, nC5 stands for an n-pentyl group, nC6 stands for an n-hexyl group, Bz stands for a benzyl group, and Azu stands or an azulenyl group.

TABLE a-1 (i) Bridged Cp(Ind)Zr Type

Cp Ind No. Q Substituent Substituent X  1a Me2Si — — Cl  2a Me2Si — — Me  3a Me2Si — — Ph  4a Me2C — — Cl  5a silacyclobutyl — — Cl  6a silacyclopentyl — — Cl  7a silacyclohexyl — — Cl  8a cyclobutylidene — — Cl  9a cyclopentylidene — — Cl 10a cyclohexylidene — — Cl

TABLE a-2 (ii) Bridged Cp(3-substituted Ind)Zr Type

Cp Ind No. Q Substituent Substituent X 11a Me2Si — 3-Me Cl 12a Me2Si — 3-Me Me 13a Me2C — 3-Me Cl 14a Me2Si — 3-Et Cl 15a Me2C — 3-Et Cl 16a Me2Si — 3-nPr Cl 17a Me2C — 3-nPr Cl 18a Me2Si — 3-iPr Cl 19a Me2C — 3-iPr Cl 20a Me2Si — 3-nBu Cl 21a Me2C — 3-nBu Cl 22a Me2Si — 3-tBu Cl 23a cyclobutylidene — 3-tBu Cl 24a Me2Si — 3-tBu Me 25a Me2C — 3-tBu Cl 26a Me2Si — 3-nC5 Cl 27a Me2Si — 3-nC6 Cl 28a Me2Si — 3-cycC6 Cl 29a Me2Si — 3-Ph Cl 30a Me2Si — 3-Bz Cl 31a Me2Si — 3-tolyl Cl 32a Me2Si — 3-TMS Cl 33a Me2Si — 3-ClPh Cl 34a Me2Si — 3-FPh Cl 35a Me2Si — 4-Me Cl 36a Me2Si — 5-Me Cl 37a Me2Si — 6-Me Cl 38a Me2Si — 3,4-Me2 Cl 39a Me2Si — 3-tBu-4-Me Cl 40a Me2Si — 4-Ph Cl

TABLE a-3 (ii) Bridged Cb(3-Substituted Ind)Zr Type (continued) No. Q Cp Substituent Ind Substituent X 41a Me2Ge — — Cl 42a Me2Ge — 3-Me Cl 43a Me2Ge — 3-Et Cl 44a Me2Ge — 3-iPr Cl 45a Me2Ge — 3-nBu Cl 46a Me2Ge — 3-tBu Cl 47a Et2Si — — Cl 48a Et2Si — 3-Me Cl 49a Et2Si — 3-Et Cl 50a Et2Si — 3-iPr Cl 51a Et2Si — 3-nBu Cl 52a Et2Si — 3-tBu Cl 53a nBu2Si — — Cl 54a nBu2Si — 3-Me Cl 55a nBu2Si — 3-Et Cl 56a nEu2Si — 3-iPr Cl 57a nBu2Si — 3-nBu Cl 58a nBu2Si — 3-tBu Cl 59a Ph2Si — — Cl 60a Ph2C — — Cl 61a Ph2Si — 3-Me Cl 62a Ph2Si — 3-Et Cl 63a Ph2Si — 3-iPr Cl 64a Ph2Si — 3-nBu Cl 65a Ph2Si — 3-tBu Cl 66a Me2Si — benz[e] Cl 67a Me2Si — dibenzo Cl 68a Me2Si — azulenyl Cl 69a Me2Si — 4-Me-Azu Cl 70a Me2Si — 4-Ph-Azu Cl 71a Me2Si — 5,6-Me2 Cl 72a Me2Si — benz[f] Cl 73a Me2Si — 6,7-dihydroindacenyl Cl 74a Me2Si — 5,5,7,7-Me4-6,7-dihydroindacenyl Cl 75a Me2Si — 5,6,7,8-H4-benz[f] Cl 76a Me2Si — 5,6,7,8-H4-5,5,8,8-Me4-benz[f] Cl

TABLE a-4 (iv) Bridged (4-Substituted Cp)(3-Substituted Ind)Zr Type

No. Q Cp Substituent Ind Substituent X 77a Me2Si 4-tBu 3-Me Cl 78a Me2Si 4-tBu 3-tBu Cl 79a Me2Si 4-tBu 3-tBu Me 80a Me2Si 4-tBu 2-Me Cl 81a Me2Si 4-tBu 2-Me-4Ph Cl 82a Me2C 2-Me 3-tBu Cl 83a Me2Si 4-tBu — Cl 84a Me2Si 2,3-Me2 3-tBu Cl 85a Me2Si 2,3,4-Me3 — Cl 86a Me2Si 2,3,4,5-Me4 — Cl 87a Me2Si 4-tBu — Me 88a Me2Si 4-tBu 4,5,6,7-H4 Cl 89a Me2Si 4-tBu Azu Cl 90a Me2Si 4-tBu 2-(2-Me-Furyl) Cl 91a Me2Si 2-(2-Me-Furyl) 3-Me Cl 92a Me2Si 4-TMS — Cl 93a Me2Si 4-(2-Br—Et) — Cl

The metallocene compound also includes, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Furthermore, in using these metallocene compounds as the component (a-1), two or more thereof may be also used.

Among specific compounds exemplified above, preferred metallocene compounds as the component (a-1) include the followings.

That is, preferred examples include dimethylsilylene-(cyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dimethyl, isopropylidene(cyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dimethyl, isopropylidene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-n-butylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-phenylindenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(3-n-butylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dimethyl, dimethylsilylene(cyclopentadienyl)(4-phenylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(benz[e]indenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, cyclobutylidene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, dimethylgermirene(cyclopentadienyl)(indenyl)zirconium dichloride, diphenylsilylene-(cyclopentadienyl)(indenyl)zirconium dichloride, diphenylmethylene(cyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(azulenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(3-methylindenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(3-tert-butylindenyl)zirconium dimethyl, dimethylsilylene(4-tert-butylcyclopentadienyl)(4-phenylindenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dimethyl, dimethylsilylene(4-tert-butylcyclopentadienyl)(4,5,6,7-tetrahydroindenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(azulenyl)zirconium dichloride, and compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Among specific examples exemplified above, more preferred examples of the metallocene compound as the component (a-1) include the followings:

dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-phenylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(4-phenylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(benz[e]indenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, isopropylidene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, dimethylgremirene(cyclopentadienyl)(indenyl)zirconium dichloride, cyclobutylidene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride, dimethylsilylene(cyclopentadienyl)(indenyl)hafnium dichloride, dimethylsilylene(cyclopentadienyl)(3-methylindenyl)hafnium dichloride, dimethylsilylene(cyclopentadienyl)(3-tert-butylindenyl)hafnium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride, dimethylsilylene(4-tert-butylcyclopentadienyl)indenyl)zirconium dichloride, and dimethylsilylene(4-tert-butylcyclopentadienyl)indenyl)zirconium dimethyl.

ii) Component (b)

The olefin polymerization catalyst recited as an example of the olefin polymerization catalyst containing, as an essential component, a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like capable of producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention contains, in addition to the component (a-1), a compound capable of reacting with the metallocene compound of the component (a-1) (component (a-1); hereinafter, sometimes simply referred to as “a”) to produce a cationic metallocene compound (component (b); hereinafter, sometimes simply referred to as “b”).

One of the compound (b) capable of reacting with the metallocene compound (a) to produce a cationic metallocene compound is an organoaluminum oxy compound.

The organoaluminum oxy compound has an Al—O—Al bond in the molecule, and the number of bonds is usually from 1 to 100, preferably from 1 to 50. Such an organoaluminum oxy compound is a product obtained usually by reacting an organoaluminum compound and water.

Incidentally, out of the organoaluminum oxy compounds, the compound obtained by reacting an alkyl aluminum and water is usually called an aluminoxane, and methylaluminoxane (encompasses those substantially composed of methylaluminoxane (MAO)) is particularly suitable as the organoaluminum oxy compound.

Other specific examples of the compound (b) capable of reacting with the metallocene compound (a) to form a cationic metallocene compound include a borane compound and a borate compound.

Specific examples of the borane compound include triphenylborane, tri(o-tolyl)borane, tri(p-tolyl)borane, tri(m-tolyl)borane, tri(o-fluorophenyl)borane, tris(p-fluorophenyl)borane, tris(m-fluorophenyl)borane, tris(2,5-difluorophenyl)borane, tris(3,5-difluorophenyl)borane, tris(4-trifluoromethylphenyl)borane, tris(3,5-ditrifluoromethylphenyl)borane, tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane, tris(perfluoronaphthyl)borane, tris(perfluorobiphenyl), tris(perfluoroanthryl)borane, and tris(perfluorobinaphthyl)borane.

Also, the borate compound is specifically, as a first example, a compound represented by the following formula (b-1): [L¹-H]⁺[BR⁶R⁷X⁴X⁵]  formula (b-1)

In formula (b-1), L¹ is a neutral Lewis base, H is a hydrogen atom, and [L¹-H] is a Broensted acid such as ammonium, anilinium and phosphonium.

Examples of the ammonium include a trialkyl-substituted ammonium such as trimethylammonium, triethylammonium, tripropylammonium, tributylammonium and tri(n-butyl)ammonium, and a dialkylammonium such as di(n-propyl)ammonium and dicyclohexylammonium.

Examples of the anilinimn include an N,N-dialkyl anilinium such as N,N-dimethylanilinium. N,N-diethylanilinium and N,N-2,4,6-pentamethylanilinium.

Furthermore, the phosphonium includes a triarylphosphonium and a trialkylarylphosphonium, such as triphenylphosphonium, tributylphosphonium, tri(methylphenyl)phosphonium and tri(dimethylphenyl)phosphonium.

In formula (b-1), R^(6b) and R⁷ are, each independently, the same or different aromatic or substituted aromatic hydrocarbon group having a carbon number of 6 to 20, preferably from 6 to 16, and may be connected to each other by a bridging group. The substituent of the substituted aromatic hydrocarbon group is preferably an alkyl group typified, for example, by a methyl group, an ethyl group, a propyl group and an isopropyl group, or a halogen atom such as fluorine, chlorine, bromine and iodine.

Each of X⁴ and X⁵ is independently a hydride group, a halide group, a hydrocarbon group having from 1 to 20 carbon atoms, or a substituted hydrocarbon group having from 1 to 20 carbon atoms, in which one or more hydrogen atoms are substituted for by a halogen atom.

Specific examples of the compound represented by formula (b-1) include tributylammoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tributylammoniumtetra(3,5-ditrifluoromethylphenyl)borate, tributylammoniumtetra(2,6-difluorophenyl)borate, tributylammoniumtetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluorophenyl)borate, dimethylaniliniumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(2,6-difluorophenyl)borate, dimethylaniliniumtetra(perfluoronaphthyl)borate, triphenylphosphoniumtetra(pentafluorophenyl)borate, triphenylphosphoniumtetra(2,6-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(3,5-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(2,6-difluorophenyl)borate, triphenylphosphoniumtetra(perfluoronaphthyl)borate, trimethylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(pentafluorophenyl)borate, triethylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(perfluoronaphthyl)borate, tripropylammoniumtetra(pentafluorophenyl)borate, tripropylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tripropylammoniumtetra(perfluoronaphthyl)borate, di(1-propyl)ammoniumtetra(pentafluorophenyl)borate, and dicyclohexylammoniumtetraphenylborate.

Among these, preferred are tributylammoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tributylammoniumtetra(3,5-ditrifluoromethylphenyl)borate, tributylammoniumtetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluorophenyl)borate, dimethylanilinumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate and dimethylaniliniumtetra(perfluoronaphthyl)borate.

A second example of the borate compound is represented by the following formula (b-2): [L²]⁺[BR⁶R⁷X⁴X⁵]⁻  formula (b-2)

In formula (b-2), L² includes, for example, a carbo-cation, a methyl cation, an ethyl cation, a propyl cation, an isopropyl cation, a butyl cation, an isobutyl cation, a tert-butyl cation, a pentyl cation, a tropinium cation, a benzyl cation, a trityl cation, a sodium cation, and a proton.

R⁶, R⁷, X⁴ and X⁵ have the same definitions as those in formula (b-1).

Specific examples of the compound above include trityltetraphenylborate, trityltetra(o-tolyl)borate, trityltetra(p-tolyl)borate, trityltetra(m-tolyl)borate, trityltetra(o-fluorophenyl)borate, trityltetra(p-fluorophenyl)borate, trityltetra(m-fluorophenyl)borate, trityltetra(3,5-difluorophenyl)borate, trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylphenyl)borate, trityltetra(perfluoronaphthyl)borate, tropiniumtetraphenylborate, tropiniumtetra(o-tolyl)borate, tropiniumtetra(p-tolyl)borate, tropiniumtetra(m-tolyl)borate, tropiniumtetra(o-fluorophenyl)borate, tropiniumtetra(p-fluorophenyl)borate, tropiniumtetra(m-fluorophenyl)borate, tropiniumtetra(3,5-difluorophenyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(3,5-ditrifluoromethylphenyl)borate, tropiniumtetra(perfluoronaphthyl)borate, NaBPh₄, NaB(o-CH₃-Ph)₄, NaB(p-CH₃-Ph)₄, NaB(m-CH₃-Ph)₄, NaB(o-F-Ph)₄, NaB(p-F-Ph)₄, NaB(m-F-Ph)₄, NaB(3,5-F₂-Ph)₄, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, NaB(3,5-(CF₃)₂-Ph)₄, NaB(C₁₀F₇)₄, H⁺BPh₄.2-diethyl ether, H⁺B(3,5-F₂-Ph)₄.2-diethyl ether, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)₂-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)₂-Ph)₄.2-diethyl ether, and H⁺B(C₁₀H₇)₄.2-diethyl ether.

Among these, preferred are trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylphenyl)borate, trityltetra(perfluoronaphthyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(3,5-ditrifluoromethylphenyl)borate, tropiniumtetra(perfluoronaphthyl)borate, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, NaB(3,5-(CF₃)₂-Ph)₄, NaB(C₁₀F₇)₄, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)₂-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)₂-Ph)₄.2-diethyl ether and H⁺B(C₁₀H₇)₄.2-diethyl ether.

Among these, more preferred are trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, tropiniumtetra(pentafluorophenyl)borate, tropiniumtetra(2,6-ditrifluoromethylphenyl)borate, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)₂-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)₂-Ph)₄.2-diethyl ether and H⁺B(C₁₀H₇)₄.2-diethyl ether.

When a borane compound or a borate compound is used as the catalyst component (b), the polymerization activity or copolymerizability increases and therefore, productivity of an ethylene-based polymer having a long-chain branch is enhanced.

Other specific examples of the compound (b) capable of reacting with a metallocene compound (a) to produce a cationic metallocene compound include a clay mineral a layered silicate compound, and a chemically treated solid oxide.

In addition, a mixture of the above-described organoaluminum oxy compound and the above-described borane compound or borate compound may be also used as the component (b), and in order to more enhance the long-chain branched structure required of the ethylene-based polymer (B) in the present invention, it is preferred to use the borane compound or borate compound in combination with the organoaluminum oxy compound. Furthermore, as for the borane compound or borate compound, two or more compounds may be mixed and used.

iii) Component (c)

The olefin polymerization catalyst recited as an example of the olefin polymerization catalyst containing, as an essential component, a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like capable of producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention preferably contains a microparticle support (component (c); hereinafter, sometimes simply referred to as “c”).

The microparticle support as the component (c) includes an inorganic support, a particulate polymer support, and a mixture thereof. As the inorganic support, a metal, a metallic oxide, a metallic chloride, a metallic carbonate, a carbonaceous substance, or a mixture thereof can be used.

Preferred examples of the metal that can be used for the inorganic support include iron, aluminum, and nickel.

The metallic oxide includes a single oxide or a composite oxide of elements belonging to Groups 1 to 14 of the periodic table, and examples thereof include various natural or synthetic, single or composite oxides such as SiO₂, Al₂O₃, MgO, CaO, B₂O₃, TiO₂, ZrO₂, Fe₂O₃, Al₂O₃.MgO, Al₂O₃.CaO, Al₂O₃.SiO₂, Al₂O₃.MgO.CaO, Al₂O₃.MgO.SiO₂, Al₂O₃.CuO, Al₂O₃.Fe₂O₃, Al₂O₃.NiO and SiO₂.MgO.

Incidentally, these formulae are not a molecular formula but indicate only a composition, and the structure and component ratio of the composite oxide for use in the present invention are not particularly limited.

Also, the metallic oxide for use in the present invention may have absorbed a small amount of water or may contain a small amount of impurities.

As the metallic chloride, for example, a chloride of an alkali metal or an alkaline earth metal is preferred, and specifically, MgCl₂, CaCl₂ and the like are suited in particular.

As the metallic carbonate, a carbonate of an alkali metal or an alkaline earth metal is preferred, and specific examples thereof include magnesium carbonate, calcium carbonate, and barium carbonate.

The carbonaceous substance includes, for example, carbon black and activated carbon.

All of these inorganic supports can be suitably used in the present invention, but among others, use of a metallic oxide, silica, alumina or the like is preferred.

A specific example of the olefin polymerization catalyst containing, as an essential component, a benzindenyl ligand or the like capable of producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention is an olefin polymerization catalyst comprising the following component (a-2), the component (b), and the preferred component (c).

iv) Component (a-2)

The component (a-2) is a metallocene compound having one or more, preferably two or more, more preferably three, benzindenyl ligands are represented by the following formula (a-2-1):

Here, each of the substituents R⁸ to R¹³ is independently a hydrocarbon group having a carbon number of 1 to 30, or a trialkyl silicon group having a hydrocarbon substituent with a carbon number of 1 to 30. Specific examples of the hydrocarbon group include an alkyl group such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group and cyclohexyl group; an alkenyl group such as vinyl group and allyl group; an aryl group such as phenyl group, dimethylphenyl group, diethylphenyl group, dipropylphenyl group, dibutylphenyl group, trimethylphenyl group, triethylphenyl group, tripropylphenyl group, tributylphenyl group, biphenyl group, naphthyl group and anthryl group: an arylalkyl group such as trityl group, phenethyl group, benzhydryl group, phenylpropyl group, phenylbutyl group and neophyl group; and an arylalkenyl group such as styryl group. These groups may have a branch. Also, out of the substituents R⁸ to R¹³, adjacent two substituents may form a ring together with the carbon atoms to which the substituents are bonded. In addition, when the component (a-2) has three cyclopentadienyl skeleton-containing ligands including the benzindenyl ligand, a metallocene complex where two or more members of those ligands are bridged, for example, by the same ethylene bridging group or dimethylsilylene groups as the bridging group composed of Q¹, Q² and R¹ defined in formula (a-1-1), such as hydrocarbon group, silylene group and substituted silylene group, is also effective. Incidentally, the center transition metal and the group (auxiliary ligand) except for a cyclopentadienyl skeleton-containing ligand bonded to the center transition metal are the same as those of M, X¹ and X² defined in formula (a-1-1), such as hydrocarbon group, alkoxyl group, halogen atom and hydrogen atom.

Specific examples of the component (a-2) where, for example, the center transition metal is Zr, are shown in Tables a-5 and a-6 below. In Tables a-5 and a-6, Cp stands for a cyclopentadienyl group, Ind stands for an indenyl group, Bzind stands for a benzindenyl group, Dbi stands for a dibenzindenyl group, Me stands for a methyl group, and Bu stands for a butyl group.

TABLE a-5 ABCDZr No. A B C D  95a BzInd BzInd Cl Cl  96a BzInd BzInd Br Br  97a BzInd BzInd Me Me  98a Dbi Dbi Cl Cl  99a Dbi Dbi Br Br 100a Dbi Dbi Me Me 101a BzInd BzInd BzInd H 102a Dbi Dbi Dbi H 103a BzInd BzInd Cp H 104a BzInd BzInd 1,3-Me2-Cp H 105a BzInd BzInd 1-Bu-3-Me-Cp H 106a BzInd BzInd Ind H 107a BzInd Ind Ind H 108a Dbi Dbi Cp H 109a Dbi Cp Cp H 110a Dbi Dbi Ind H 111a Dbi Ind Ind H 112a BzInd BzInd Dbi H 113a BzInd Dbi Dbi H 114a BzInd Dbi Cp H 115a BzInd Dbi Ind H

TABLE a-6

No. A1 A2 A3 A4 A5 116a Et Ind Ind BzInd H 117a Et Ind Ind Dbi H 118a Me2Si Cp Cp BzInd H 119a Me2Si Cp Cp Dbi H 120a Me2Si Cp Ind Dbi H 121a Et BzInd BzInd Cp H 122a Et BzInd BzInd Ind H

Specific preferred examples of the component (a-2) are Bzind₃ZrH, Dbi₃ZrH, Bzind₂CpZrH, Bzind₂(1,3-Me₂Cp)ZrH, Bzind₂(1-Bu-3-MeCp)ZrH, Bzind₂IndZrH, BzindInd₂ZrH, Dbi₂CpZrH, DbiCp₂ZrH, Dbi₂IndZrH, DbiInd₂ZrH, Bzind₂DbiZrH, BzindDbi₂ZrH, BzindDbiCpZrH, BzindDbiIndZrH, Et(Ind)₂BzindZrH, Et(Ind)₂DbiZrH, Me₂SiCp₂BzindZrH, Me₂SiCp₂DbiZrH, Me₂Si(Cp)(Ind)DbiZrH, Et(Bzind)₂CpZrH and Et(Bzind)₂IndZrH, and more preferred specific examples are Bzind₃ZrH, Dbi₃ZrH, Bzind₂CpZrH, Bzind₂(1,3-MeCp)ZrH, Bzind₂(1-Bu-3-MeCp)ZrH, Bzind₂IndZrH, BzindInd₂ZrH, Dbi₂CpZrH, DbiCp₂ZrH, Dbi₂IndZrH, DbiInd₂ZrH, Bzind₂DbiZrH, BzindDbi₂ZrH, BzindDbiCpZrH and BzindDbiIndZrH.

As described above, together with the component (a-2), the organoaluminum oxy compound above or the like is used as the component (b), and also in this case, the borane compound or borate compound is preferably used in combination with the organoaluminum oxy compound so as to more enhance the characteristics of the long-chain branched structure required of the ethylene-based polymer (B) in the present invention. Similarly, it is also preferred to contain the component (c) in addition to the component (a-2) and the component (b).

A specific example of the olefin polymerization catalyst containing, as an essential component, a mixture of a complex having a bridged bis(indenyl), bridged bis(azulenyl) or bridged bis(cyclopentadienyl) ligand capable of producing a long-chain branched structure as the ethylene-based polymer (B) of the present invention and a borane or borate compound as a compound for producing a cationic metallocene compound together with an organoaluminum oxy compound is an olefin polymerization catalyst comprising the following component (a-3), a mixture of an organoaluminum oxy compound and a borane or borate compound described in the component (b), and the preferred component (c).

Here, the complex having a bridged bis(indenyl) ligand, a bridged bis(azulenyl) ligand or a bridged bis(cyclopentadienyl) ligand (referred to as components (a-3-1), (a-3-2) and (a-3-3), respectively) indicates a complex having a basic skeleton where same or different two cyclopentadienyl rings or same or different two indenyl rings as represented by formula [2] in the classification of metallocene compounds described above in the paragraph of 1-6. (ii) Metallocene Catalyst are bridged by a bridging group Q¹. The substituent which can be substituted on the cyclopentadienyl ring, indenyl ring, azulenyl ring or bridging group Q¹ has a high degree of freedom as long as it does not inhibit the basic skeleton structure, and a metallocene complex or the like having a heteroatom-containing monocyclic or polycyclic heteroaromatic group as a substituent on a ligand of a conjugated 5-membered ring structure described, for example, in JP-T-2002-535339 may be also suitably used.

[wherein each of A³ and A⁴ represents a ligand having a conjugated 5-membered ring structure (A³ and A⁴ may be the same or different in the same compound). Q¹ represents a bonding group for bridging two conjugated 5-membered ring ligands at arbitrary positions, M represents a metal atom selected from Group 4 of the periodic table, and each of X and Y independently represents a hydrogen atom, a halogen atom, a hydrocarbon group, an alkoxy group, an amino group, a phosphorus-containing hydrocarbon group or a silicon-containing hydrocarbon group, which is bonded to M].

As specific examples of the complex having a bridged bis(indenyl) ligand of the component (a-3-1), when the center transition is Zr:

(I) out of the compounds represented by formula [2], compounds where the bonding group Q¹ has, for example, a structure recited below, are shown in Tables a-7 to a-9. In Tables a-7 to a-9, Ind stands for an indenyl group, and TMS stands for a trimethylsilyl group.

(I-1) When Q¹ is an alkylene group, the complex includes, for example, the compounds shown in Table a-7 below.

TABLE a-7 Q¹ = alkylene group No. Q1 A3 A4 X Y 123a CH2 Ind Ind Cl Cl 124a Et Ind Ind Cl Cl 125a Et Ind Ind Cl H 126a Et Ind Ind Cl Me 127a Et Ind Ind Cl OMe 128a Et Ind Ind OEt OEt 129a Et Ind Ind Me Me 130a Et H4Ind H4Ind Cl Cl 131a Et 2-Me-Ind 2-Me-Ind Cl Cl 132a Et 2-Et-Ind 2-Et-Ind Cl Cl 133a Et 2,4-Me2-Ind 2,4-Me2-Ind Cl Cl 134a Et 4-Ind 4-Ind Cl Cl 135a Et 2-(2-(5-MeFuryl))Ind 2-(2-(5-MeFuryl))Ind Cl Cl 136a Et 2-(2-(5-MeFuryl))-4-Ph-Ind 2-(2-(5-MeFuryl))-4-Ph-Ind Cl Cl 137a Et 4-(2,7-Me2-Ind) 4-(2,7-Me2-Ind) Cl Cl 138a Et 2-(2-(5-tBuFuryl)-4-Ph- 2-(2-(5-tBuFuryl)-4-Ph- Cl Cl Ind) Ind) 139a Et 2-(2-(5-tBuFuryl)-4-Ph- Ind Cl Cl Ind) 140a Et 4-Ph-Ind 4-Ph-Ind Cl Cl 141a Me2C Ind Ind Cl Cl 142a Et Ind Ind Cl H

(I-2) When Q¹ is a silylene group, the complex includes, for example, the compounds shown in Table a-8 below. In Table a-8, Ind stands for an indenyl group, BenInd stands for a benzindenyl group, PhInd stands for a phenylindenyl group, and TMSPh stands for a trimethylsilylphenyl group.

TABLE 8 [a-8] Q¹ = silylene group No. Q1 A3 A4 X Y 143a Me2Si Ind Ind Cl Cl 144a Me2Si 4,5,6,7-H4Ind 4,5,6,7-H4Ind Cl Cl 145a Me2Si 2-Me-Ind 2-Me-Ind Cl Cl 146a Me2Si 2,4-Me2-Ind 2,4-Me2-Ind Cl Cl 147a Me2Si 2-Me-4,5,6,7-H4Ind 2-Me-4,5,6,7-H4Ind Cl Cl 148a Me2Si 2-Me-4,5-BenInd 2-Me-4,5-BenInd Cl Cl 149a Me2Si 2-Me-4-Ph-Ind 2-Me-4-Ph-Ind Cl Cl 150a Me2Si 2-Me-4,4-Me2-4,5,6,7-H4-4- 2-Me-4,4-Me2-4,5,6,7-H4-4- Cl Cl silaindenyl silaindenyl 151a Me2Si 4-(2-Ph-Ind) 4-(2-Ph-Ind) Cl Cl 152a Me2Si 4-(2-tBuInd) 4-(2-tBuInd) Cl Cl 153a Me2Si 4-(2-Ph-3-MeInd) 4-(2-Ph-3-MeInd) Cl Cl 154a PhMeSi Ind Ind Cl Cl 155a PhMeSi 4,5,6,7-H4Ind 4,5,6,7-H4Ind Cl Cl 156a Ph2Si Ind Ind Cl Cl 157a tetramethyl- Ind Ind Cl Cl disilylene 158a Me2Si 2-(2-(5-MeFuryl))-4-PhInd 2-(2-(5-MeFuryl))-4-PhInd Cl Cl 159a Me2Si 2-(2-(5-TMSFuryl))-4-PhInd 2-(2-(5-TMSFuryl))-4-PhInd Cl Cl 160a Me2Si 2-(2-(5-PhFuryl)-4-PhInd) 2-(2-(5-PhFuryl)-4-PhInd) Cl Cl 161a Me2Si 2-(2-(5-Methienyl))-4- 2-(2-(5-Methienyl))-4- Cl Cl PhInd PhInd 162a Me2Si 2-(2-(4,5-Me2Furyl))-4- 2-(2-(4,5-Me2Furyl))-4- Cl Cl PhInd PhInd 163a Me2Si 2-(2-BenFuryl)-4-PhInd 2-(2-BenFuryl)-4-PhInd Cl Cl 164a Me2Si 2-(2-BenThienyl)-4-(4- 2-(2-BenThienyl)-4-(4- Cl Cl TMSPh)-Ind TMSPh)-Ind 165a Me2Si 2-(2-(5-TMSFuryl))-4-(2- 2-(2-(5-TMSFuryl))-4-(2- Cl Cl Naph)-Ind Naph)-Ind 166a PhMeSi 2-(2-(5-MeFuryl))-4-PhInd 2-(2-(5-MeFuryl))-4-PhInd Cl Cl 167a Me2Si 2-(2-(5-MeFuryl))-4-PhInd 2-(2-(5-MeFuryl))-4-(4- Cl Cl tBuPh)-Ind 168a Me2Si 2-(2-(5-MeFuryl))-4-PhInd 2-(2-(5-MeFuryl))-4-(4- Cl Cl TMSPh)-Ind 169a Me2Si 2-(2-(5-MeFuryl))-4-(4- 2-(2-(5-MeFuryl))-4-(4- Cl Cl tBuPh)-Ind TMSPh)-Ind

(I-3) When Q¹ is a hydrocarbon group containing germanium, phosphorus, nitrogen, boron or aluminum, the complex includes, for example, the compounds shown in Table a-9 below. In Table a-9, Ind stands for an indenyl group, PhInd stands for a phenylindenyl group, and TMSPh stands for a trimethylsilylphenyl group.

TABLE a-9 No. Q1 A3 A4 X Y 170a Me2Ge Ind Ind Cl Cl 171a MeAl Ind Ind Cl Cl 172a PhAl Ind Ind Cl Cl 173a PhP Ind Ind Cl Cl 174a EtB Ind Ind Cl Cl 175a PhN Ind Ind Cl Cl 176a Me2Ge 2-(2-(5-MeFuryl))-4- 2-(2-(5-MeFuryl))- Cl Cl PhInd 4-PhInd 177a MeB 2-(2-(5-MeFuryl))-4-(4- 2-(2-(5-MeFuryl))- Cl Cl TMSPh)-Ind 4-(4-TMSPh)-Ind

As specific examples of the complex having a bridged bis(azulenyl) ligand of the component (a-3-2), when the center transition is Zr:

(II) out of the compounds represented by formula [2], compounds where the bonding group Q¹ has, for example, a structure recited below, are shown in Tables a-10 to a-12.

(II-1) When Q¹ is an alkylene group, the complex includes, for example, the compounds shown in Table a-10 below. In Tables a-10 to a-12, tBuPh stands for tributylphenyl group, TMSPh stands for a trimethylsilylphenyl group, NaPh stands for a naphthyl group, BiPh stands for a biphenyl group. Azu stands for an azulenyl group, and ClPh stands for a chlorophenyl group.

TABLE a-10 Q¹ = alkylene group No. Q1 A3 A4 X Y 178a CH2 2-Et-4-(3-Cl-4-tBuPh)-4- 2-Et-4-(3-Cl-4-tBuPh)-4- Cl Cl HAzu HAzu 179a Et 2-Me-4-(3-Me-4-tBuPh)-4- 2-Me-4-(3-Me-4-tBuPh)-4- Cl Cl HAzu HAzu 180a Et 2-Me-4-(3-Cl-4-TMSPh)-4- 2-Me-4-(3-Cl-4-TMSPh)-4- Cl H HAzu HAzu 181a Et 2-Me-4-(2-Naph)-4-HAzu 2-Me-4-(2-Naph)-4-HAzu Cl Me 182a Et 2-Me-4-(2-F-4-BiPh)-4-HAzu 2-Me-4-(2-F-4-BiPh)-4- Cl OMe HAzu 183a Et 2-Me-4-(2-Cl-4-BiPh)-4- 2-Me-4-(2-Cl-4-BiPh)-4- OEt OEt HAzu HAzu 184a Et 2-Me-4-(9-phenanthryl)-4- 2-Me-4-(9-phenanthryl)-4- Me Me HAzu HAzu

(II-2) When Q¹ is a silylene group, the complex includes, for example, the compounds shown in Table a-11 below.

TABLE a-11 Q¹ = silylene group No. Q1 A3 A4 X Y 185a Me2Si 2-Me-4-Ph-4-HAzu 2-Me-4-Ph-4-HAzu Cl Cl 186a Me2Si 2-Me-4-(4-ClPh)-4-HAzu 2-Me-4-(4-ClPh)-4-HAzu Cl Cl 187a Me2Si 2-Me-4-(4-tBuPh)-4-HAzu 2-Me-4-(4-tBuPh)-4-HAzu Cl Cl 188a Me2Si 2-Me-4-(4-TMSPh)-4-HAzu 2-Me-4-(4-TMSPh)-4-HAzu Cl Cl 189a Me2Si 2-Me-4-(3-Cl-4-tBuPh)-4-HAzu 2-Me-4-(3-Cl-4-tBuPh)-4-HAzu Cl Cl 190a Me2Si 2-Me-4-(3-Me-4-TMSPh)-4-HAzu 2-Me-4-(3-Me-4-TMSPh)-4-HAzu Cl Cl 191a Me2Si 2-Me-4-(1-Naph)-4-HAzu 2-Me-4-(1-Naph)-4-HAzu Cl Cl 192a Me2Si 2-Et-4-(4-ClPh)-4-HAzu 2-Et-4-(4-ClPh)-4-HAzu Cl Cl 193a Me2Si 2-Me-4-(4-Cl-2-Naph)-4-HAzu 2-Me-4-(4-Cl-2-Naph)-4-HAzu Cl Cl 194a Me2Si 2-nPr-4-(3-Cl-4-TMSPh)-4- 2-nPr-4-(3-Cl-4-TMSPh)-4- Cl Cl HAzu HAzu

(II-3) When Q¹ is a hydrocarbon group containing germanium, phosphorus, nitrogen, boron or aluminum, the complex includes, for example, the compounds shown in Table a-12 below.

TABLE a-12 No. Q1 A3 A4 X Y 195a Me2Ge 2-Me-4-(2-F-4-BiPh)- 2-Me-4-(2-F-4-BiPh)- Cl Cl 4-HAzu 4-HAzu 196a PhAl 2-Me-4-(2-F-4-BiPh)- 2-Me-4-(2-F-4-BiPh)- Cl Cl 4-HAzu 4-HAzu 197a Me2Ge 2-Me-4-(4-tBuPh)-4- 2-Me-4-(4-tBuPh)-4- Cl Cl HAzu HAzu

As specific examples of the complex having a bridged bis(cyclopentadienyl) ligand of the component (a-3-3), when the center transition is Zr:

(III) out of the compounds represented by formula [2], compounds where the bonding group Q¹ has, for example, a structure recited below, are shown in Tables a-13 to a-16. In Tables a-13 to a-16, Cp stands for a cyclopentadienyl group, TMS stands for trimethylsilyl, and Flu stands for fluorenyl.

(III-1) When Q¹ is an alkylene group, the complex includes, for example, the compounds shown in Table a-13 below.

TABLE a-13 Q¹ = alkylene group No. Q1 A3 A4 X Y 198a Et 2,4-Me2Cp 3′,5′-MeCp Cl Cl 199a Et 2-Me-4-tBuCp 3′-tBu-5′-MeCp Cl Cl 200a Et 2,3,5-Me3Cp 2′,4′,5′-Me3Cp Cl Cl 201a Me2C 2,4-Me2Cp 3′,5′-Me2Cp Cl Cl 202a CH2 Cp 3,4-Me2Cp Cl Cl 203a CH2 Cp 3,4-Me2Cp Cl H 204a CH2 Cp 3,4-Me2Cp Me Me 205a CH2 Cp 3,4-Me2Cp Ph Ph 206a CH2 Cp TMSCp Cl Cl 207a CH2 Cp Me4Cp Cl Cl 208a Me2C Cp 3,4-Me2Cp Cl Cl 209a Me2C Cp Me4Cp Cl Cl 210a Me2C Cp Flu Cl Cl 211a Me2C 2-MeCp Flu Cl Cl 212a Me2C 3-tBuCp Flu Cl Cl 213a Me2C 2,5-Me2Cp 3′,4′-Me2Cp Cl Cl 214a Me2C 2,5-Me2Cp Flu Cl Cl 215a Et Cp 3,5-Me2Cp Cl Cl 216a Et Cp Flu Cl Cl 217a Et 2,5-Me2Cp Flu Cl Cl 218a Et 2,5-Et2Cp Flu Cl Cl 219a Ph2C Cp 3,4-Et2Cp Cl Cl 220a cyclohexylidene Cp Flu Cl Cl 221a cyclohexylidene 2,5-Me2Cp 3′,4′-Me2Cp Cl Cl 222a Et 2-(2-(5-MeFuryl))Cp 2-(2-(5-MeFuryl))Cp Cl Cl 223a Et 2-(2-(5-MeFuryl))-4-PhCp 2-(2-(5-MeFuryl))-4- Cl Cl PhCp 224a Et 2-(2-(5-tBuFuryl))Cp 2-(2-(5-tBuFuryl))Cp Cl Cl 225a Et 2-(2-(5-tBuFuryl))-4- Cp Cl Cl PhCp

(III-2) When Q¹ is a silylene group, the complex includes, for example, the compounds shown in Tables a-14 and a-15 below.

TABLE a-14 Q¹ = silylene group No. Q A3 A4 X Y 227a Me2Si 2,4-Me2Cp 3′,5′-MeCp Cl Cl 228a PhMeSi 2,4-Me2Cp 3′,5′-MeCp Cl Cl 229a PhMeSi 2,3,5-Me3Cp 2′,4′,5′-Me3Cp Cl Cl 230a PhMeSi Me4Cp Me4Cp Cl Cl 231a tetramethyl- Cp Cp Cl Cl disilylene 232a Me2Si Cp 3,4-Me2Cp Cl Cl 233a Me2Si Cp Me3Cp Cl Cl 234a Me2Si Cp Me4Cp Cl Cl 235a Me2Si Cp 3,4-Et2Cp Cl Cl 236a Me2Si Cp Et3Cp Cl Cl 237a Me2Si Cp Me4Cp Cl Cl 238a Me2Si Cp Flu Cl Cl 239a Me2Si 3-tBuCp Flu Cl Cl 240a Me2Si Cp 2,7-tBu2Flu Cl Cl 241a Me2Si Cp H8Flu Cl Cl 242a Me2Si 2-MeCp Flu Cl Cl 243a Me2Si 2,5-Me2Cp Flu Cl Cl 244a Me2Si 2-EtCp Flu Cl Cl 245a Me2Si 2,5-Et2Cp Flu Cl Cl 246a Et2Si 2-MeCp 2′,7′-tBu2Flu Cl Cl 247a Me2Si 2,5-Me2Cp 2′,7′-tBu2Flu Cl Cl 248a Me2Si 2-EtCp 2′,7′-tBu2Flu Cl Cl 249a Me2Si Et2Cp 2′,7′-tBu2Flu Cl Cl 250a Me2Si Et2Cp H8Flu Cl Cl 251a Me2Si Me2Cp H8Flu Cl Cl 252a Me2Si EtCp H8Flu Cl Cl 253a Me2Si Et2Cp H8Flu Cl Cl

TABLE a-15 Q¹ = silylene group (continued) No. Q A3 A4 X Y 254a Me2Si 2-(2-(5-tBuFuryl))Cp 2-(2-(5-tBuFuryl))Cp Cl Cl 255a Me2Si 2-(2-(5-TMSFuryl))Cp 2-(2-(5-TMSFuryl))Cp Cl Cl 256a Me2Si 2-(2-(5-PhFuryl))Cp 2-(2-(5-PhFuryl))Cp Cl Cl 257a Me2Si 2-(2-(5-MeThienyl))Cp 2-(2-(5-MeThienyl))Cp Cl Cl 258a Me2Si 2-(2-(4,5-Me2Furyl))Cp 2-(2-(4,5-Me2Furyl))Cp Cl Cl 259a Me2Si 2-(2-BenFuryl)Cp 2-(2-BenFuryl)Cp Cl Cl 260a Me2Si 2-(2-BenThienyl)-4-(4-TMSPh)Cp 2-(2-BenThienyl)-4-(4- Cl Cl TMSPh)Cp 261a Me2Si 2-(2-(5-TMSFuryl))Cp 2-(2-(5-TMSFuryl))Cp Cl Cl 262a PhMeSi 2-(2-(5-MeFuryl))Cp 2-(2-(5-MeFuryl))Cp Cl Cl 263a Me2Si 2-(2-(5-MeFuryl))Cp Cp Cl Cl 264a Me2Si 2-(2-(5-MeFuryl))-4-PhCp 2-(2-(5-MeFuryl))Cp Cl Cl 265a Me2Si 2-(2-(5-MeFuryl))Cp 3-MeCp Cl Cl

(III-3) When Q¹ is a hydrocarbon group containing germanium, phosphorus, nitrogen, boron or aluminum, the complex includes, for example, the compounds shown in Table a-16 below.

TABLE a-16 No. Q1 A3 A4 X Y 266a Me2Ge Cp Flu Cl Cl 267a PhN Cp Flu Cl Cl 268a Me2Ge 2-(2-(5-MeFuryl))Cp 2-(2-(5-MeFuryl))Cp Cl Cl 269a MeB 2-(2-(5-MeFuryl))-4- 2-(2-(5-MeFuryl))-4- Cl Cl TMSCp TMSCp

Thanks to a catalyst where a mixture of an organoaluminum oxy compound and a borane compound or the like is combined with a complex having a bridged bis(indenyl) ligand, a bridged bis(azulenyl) ligand or a bridged bis(cyclopentadienyl) ligand, which is defined by the compounds above, a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention is imparted to an ethylene-based polymer (B).

In the foregoing pages, three catalyst systems, that is, a catalyst system containing, as an essential component, a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like, a catalyst system containing, as an essential component, a complex having a benzindenyl ligand or the like, and a catalyst system using a mixture of a complex having a bridged bis(indenyl) ligand or a bridged bis(cyclopentadienyl) ligand, which is a metallocene complex, and a borane or borate compound that is a compound capable of producing a cationic metallocene compound together with an organoaluminum oxy compound, are described as specific preferred examples of the olefin polymerization catalyst for producing a long-chain branched structure suitable as the ethylene-based polymer (B) of the present invention. Among these, a catalyst system containing, as an essential component, a complex having a bridge (cyclopentadienyl)(indenyl) ligand or the like and a catalyst system using a mixture of a complex having a bridged bis(indenyl) ligand or a bridged bis(cyclopentadienyl) ligand, which is a metallocene complex, and a borane or borate compound that is a compound capable of producing a cationic metallocene compound together with an organoaluminum oxy compound, are more preferred, and a catalyst system containing, as an essential component, a complex having a bridged (cyclopentadienyl)(indenyl) ligand or the like is still more preferred.

In the present invention, the production of the ethylene-based polymer (B) is performed by contacting ethylene with the olefin polymerization catalyst (i) to (iv), more preferably (i), (ii) or (iv), still more preferably (i) or (ii), yet still more preferably (ii) the metallocene catalyst, thereby polymerizing or copolymerizing the ethylene. As the olefin polymerization catalyst, a plurality of kinds of catalyst may be selected from (i) to (iv) and used. At the time of performing polymerization or copolymerization of ethylene, all descriptions of the polymerization method, ethylene raw material, polymerization medium, polymerization temperature and the like, polymerization process and the like, and scavenger in the paragraph of Production Method of Ethylene-Based Polymer (A) above may be referred to. However, it is needless to say that these various conditions must be optimally set by taking into account various characteristics required of the ethylene-based polymer (B) and the characteristics of the olefin polymerization catalyst used. For example, in the case of desiring for an ethylene-based polymer (B) having a lower MFR and a lower density, the chain transfer agent concentration is set relatively low, the α-olefin concentration is set relatively high, in order to prevent a polymer in the production process from a trouble such as fixing⋅blocking, various operation temperatures are set on the low temperature side as appropriate for the melting temperature or the like of the polymer, a low-molecular-weight hydrocarbon solvent hardly causing dissolution of the polymer such as propane and butane, is selected in the slurry polymerization, a gas phase polymerization not using a solvent is selected, or solution polymerization treating the polymer in the molten state is selected. Also, in the case of intending to impart distinctive long-chain branch characteristics, it is preferred to aggressively select a low monomer concentration condition, a high polymer concentration condition, a low scavenger concentration condition, a high temperature polymerization condition, a long time polymerization condition or the like so that the chain transfer reaction except for hydrogen can be accelerated.

(3) Other Components (C)

In the polyethylene-based resin composition of the present invention, as long as the purpose of the present invention is not impaired, the following substances can be blended as an optional component, in addition to the ethylene-based polymer (A) and the ethylene-based polymer (B), which are essential components.

3-1. Other Ethylene-Based Polymers

In addition to the ethylene-based polymer (A) and the ethylene-based polymer (B), various ethylene-based polymers and modification products thereof, such as high-density polyethylene, low-density polyethylene, high-pressure polyethylene, polar monomer graft-modified polyethylene, ethylene-based wax, ultrahigh molecular weight polyethylene and ethylene-based elastomer, can be used. Addition of a high-density polyethylene is preferred for enhancing the stiffness, heat resistance, impact strength and the like. Addition of a low-density polyethylene is preferred for enhancing the flexibility, impact strength, easy adhesiveness, transparency, low-temperature strength and the like. Addition of a high-pressure polyethylene is preferred for enhancing the flexibility, easy adhesiveness, transparency, low-temperature strength, moldability and the like. Addition of a polar monomer graft-modified polyethylene such as maleic acid-modified polyethylene, ethylene.acrylic acid derivative copolymer and ethylene.vinyl acetate copolymer is preferred for enhancing the flexibility, easy adhesiveness, colorability, affinity for various materials, gas barrier property and the like. Addition of an ethylene-based wax is preferred for enhancing the colorability, affinity for various materials, moldability and the like. Addition of an ultrahigh molecular weight polyethylene is preferred for enhancing the mechanical strength, abrasion resistance and the like. Addition of an ethylene-based elastomer is preferred for enhancing the flexibility, mechanical strength, impact strength and the like.

3-2. Other Olefin-Based Polymer

As an olefin-based polymer other than an ethylene-based polymer, for example, a polypropylene-based resin, a higher olefin-based resin such as polybutene, polyisobutene and polyhexene, an olefin-based rubber, a polybutadiene-based resin such as butadiene, isoprene and chloroprene, a polystyrene-based resin such as polystyrene and poly-α-methylstyrene, various cyclic olefin-based resin, and modification products thereof can be used.

3-3. Other Resins

Various resins containing, as a main component, a polymer except for the above-described ethylene-based polymer or other olefin-based polymers can be used. Specific examples thereof include various nylon resins, various polyamides, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), various polyesters, a polycarbonate resin, EVOH, EVA, PMMA, PMA, various engineering plastics, polylactic acid, celluloses, natural rubbers, polyurethane, vinyl chloride, fluororesin such as Teflon (registered trademark), and an inorganic polymer such as silicon resin.

3-4. Additive

All additives may be appropriately used individually or in combination of two or more thereof. Specifically, for example, an antioxidant (e.g., phenol type, phosphorus type, sulfur type), an ultraviolet absorber-ultraviolet inhibitor, a light stabilizer⋅weatherproofing agent, a lubricant, an antistatic agent, an antifogging agent, an antiblocking agent, a processing aid such as dispersant, a color pigment (organic or inorganic pigment), a pearl pigment, a polarizing pearl pigment, a crosslinking agent, a blowing agent, a neutralizer, a heat stabilizer, a crystallization nucleating agent, an inorganic or organic bulking agent⋅filler [such as calcium carbonate, talc, metal powder (e.g., aluminum copper, iron, lead), silica dust, diatomaceous earth, alumina, gypsum, mica, clay, asbestos, graphite, carbon black and titanium oxide], and a flame retardant can be used.

(4) Mixing of Respective Components Constituting Polyethylene-Based Resin Composition of the Present Invention

The polyethylene-based resin composition of the present invention is produced by mixing the ethylene-based polymer (A), the ethylene-based polymer (B), which are essential components, and the substance (C) as an optional component.

The blending ratio of respective components is from 41 to 99 wt % of the ethylene-based polymer (A) and from 1 to 59 wt % of the ethylene-based polymer (B), preferably from 61 to 96 wt % of the ethylene-based polymer (A) and from 4 to 39 wt % of the ethylene-based polymer (B), more preferably from 69 to 96 wt % of the ethylene-based polymer (A) and from 4 to 31 wt % of the ethylene-based polymer (B), still more preferably from 69 to 91 wt % of the ethylene-based polymer (A) and from 9 to 31 wt % of the ethylene-based polymer (B), yet still more preferably from 75 to 89 wt % of the ethylene-based polymer (A) and from 11 to 25 wt % of the ethylene-based polymer (B). If the proportion of the ethylene-based polymer (A) is too large, the polyethylene-based resin composition or its molded product may be reduced in the impact resistance or transparency and out of the moldability, the melt tension decreases, whereas if the proportion is small, the stiffness may be deteriorated and out of the moldability, the melt extrudability becomes bad. If the proportion of the ethylene-based polymer (B) is too large, the polyethylene-based resin composition or its molded product may be reduced in the stiffness or transparency and out of the moldability, the melt extrudability becomes bad, whereas if the proportion is small, the tear strength, impact strength and transparency may not be improved and out of the moldability, the melt tension decreases. Incidentally, the proportion of the substance (C) as an optional component is appropriately set as long as the purpose of the present invention is not impaired, but the proportion is usually from 0 to 49 wt % and particularly, in using various additives recited in Item 3-4 above, all existing examples related to application to known polyethylene-based resins, polyethylene-based resin compositions and their molded product may be referred to.

In producing the polyethylene-based resin composition of the present invention by mixing the ethylene-based polymer (A), the ethylene-based polymer (B), which are essential components, and the substance (C) as an optional component, the mixing method therefor or the apparatus used is not particularly limited, but usually, these components are mixed using a Henschel mixer, a super-mixer, a tumbler-type mixer or the like, kneaded under heating, for example, in a mixing extruder such as single- or twin-screw extruder, kneader and plunger extruder, or in a Banbury mixer, and then pelletized. The kneading under heating can be performed in the presence or absence of a liquid, a solvent or a gas. The order of mixing those components is also not particularly limited, and, for example, the following methods (D-1) to (D-4) may be recited:

(D-1) a method where the ethylene-based polymer (A), the ethylene-based polymer (B) and the optional substance (C) all in the solid state, preferably all in the powder, particle or pellet state, are previously contacted and mixed with each other, and the mixture is put into a more uniform state by kneading under heating;

(D-2) a method where any one or more components of the ethylene-based polymer (A), the ethylene-based polymer (B) and the optional substance (C) are put into a molten state, a dissolved state or a liquid state and then contacted and mixed with other components, and the mixture is furthermore put into a more uniform state by kneading under heating;

(D-3) a method where any two components of the ethylene-based polymer (A), the ethylene-based polymer (B) and the optional substance (C) are previously kneaded under heating by, for example, the method (D-1) or (D-2) above, and the mixture obtained by the kneading under heating is further kneaded under heating with the remaining one component and thereby put into a more uniform state, and

(D-4) a method where any one component of the ethylene-based polymer (A), the ethylene-based polymer (B) and the optional substance (C) is previously kneaded under heating with, individually and separately, both of the remaining two components, for example, by the method (D-1) or (D-2), and the mixtures obtained by the kneading under heating is further kneaded under heating and thereby put into a more uniform state.

(5) Physical Properties of Polyethylene-Based Resin Composition of the Present Invention

The polyethylene-based resin composition of the present invention is produced by mixing the ethylene-based polymer (A), the ethylene-based polymer (B), which are essential components, and the substance (C) as an optional component, for example, by the mixing method of (D-1) to (D-4) above, and as for the physical properties, the composition as a whole must satisfy the ranges of MFR and density described below.

5-1. MFR

The melt flow rate (MFR) of the polyethylene-based resin composition of the present invention is from 0.05 to 50 g/10 min, preferably from 0.1 to 20 g/10 min, more preferably from 0.3 to 10 g/10 min, still more preferably from 0.4 to 5.0 g/10 min, yet still more preferably from 0.5 to 3.0 g/10 min. If MFR is less than 0.05 g/10 min, the flowability of the polyethylene-based resin composition is bad, and this may disadvantageously require a too high motor load of the extruder or lead to poor spreadability. If MFR exceeds 50 g/10 min, the polyethylene-based resin composition or its molded product becomes inferior in the mechanical strength such as impact strength, tear strength and tensile strength or in the moldability, and this is not preferred. Incidentally, MFR indicates a value when measured under the same conditions as the condition (A-1) above.

5-2. Density

The density of the polyethylene resin composition of the present invention is from 0.910 to 0.960 g/cm³, preferably from 0.910 to 0.950 g/cm³, more preferably from 0.916 to 0.940 g/cm³, still more preferably from 0.919 to 0.938 g/cm³, yet still more preferably from 0.920 to 0.936 g/cm³, and most preferably from 0.921 to 0.934 g/cm³.

If the density of the polyethylene resin composition is less than 0.910 g/cm³, the polyethylene-based resin composition or its molded product may be reduced in the stiffness or become sticky and when the product is a molded product having a small thickness, such as film and sheet, as well as various problems in using the product, a problem is disadvantageously brought about in the step of winding up the product or the post-processing step such as surface printing⋅lamination, leading to poor suitability for automatic bag machine, or when the product is a molded product having a large wall thickness, such as pipe and various containers, since the product is too soft and undergoes deformation, the wall thickness must be disadvantageously designed to be larger than necessary. Also, if the density of the polyethylene resin composition exceeds 0.960 g/cm³, the impact strength of the polyethylene-based resin composition or its molded product may be reduced and the transparency may also become bad. Incidentally, the density indicates a value when measured under the same conditions as the condition (A-2) above.

[II] Molded Product and Use of Polyethylene-Based Resin Composition of the Present Invention

The molded product of the polyethylene-based resin composition of the present invention is produced by molding the polyethylene-based resin composition of the present invention described in [I] above, and as for the molding method, all of molding methods for a polyolefin-based resin or a polyolefin-based resin composition, such as injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding and blow molding, which are conventionally known, may be referred to.

The molded product as used in the present invention indicates a processed article or a shaped article obtained by processing or shaping the polyethylene-based resin composition into an appropriate form according to the intended use, and specific examples thereof include a film, a bag, a sheet, a coating, a fiber, a yarn, a container, a tube, a pipe, a covering material, a lid, a cap, a box, sundry articles, toys, medical device parts, a bead, a fine particle, and a foamed product. These articles may have a multilayer structure or may be a composite article with other members. As for these molded articles of the polyethylene-based resin composition of the present invention, specific examples of use thereof include a standardized bag mandated by the dimensional standard, such as bag-in-paper bag and garbage bag, a heavy duty sack, a wrapping film, a sugar bag, a rice bag, an oily substance packaging bag, a food packaging film in a bag for packaging a watery material such as pickles, an agricultural film, a laminate with various substrates such as nylon, polyester, metal foil and saponified ethylene-vinyl acetate copolymer, a foamed body, and a molded product thereof, and applications of a molded product of known polyethylene-based resins and polyethylene-based resin compositions, such as bag-in-box, detergent container, edible oil container, retort container, medical container, chemical container, solvent container, agricultural container, various plastic bottle products, hollow container (e.g., kerosene can, drum, fuel tank), infusion bag, various tubes, pipe (e.g., water pipe, gas pipe), Tupperware container cover, bottle cap and container, may be referred to.

The molding method for the molded product of the present invention is not particularly limited as long as it is a method capable of effectively utilizing excellent molding characteristics, various mechanical properties and transparency of the polyethylene-based resin composition of the present invention, but in the case of a film, bag or sheet as an example of the application in which the polyethylene-based resin composition of the present invention is intended to be mainly used, preferred examples of the molding method, molding conditions and use include, specifically, various inflation molding methods, T-die film molding methods, calendar molding methods, multilayer film molding methods using a multilayer coextrusion molding machine or lamination processing, and various applications, which are described in detail, for example, in JP-A-2007-197722, JP-A-2007-177168, JP-A-2007-177187 and JP-A-2010-31270. Of course, a gas other than air, or a liquid can be used as a cooling medium in the inflation molding and may be also used in special inflation such as stretch (inflation simultaneous biaxial stretching) molding and multi-stage blow-molding.

The thus-obtained film (or sheet) product is not particularly limited in its sheet, and the suitable thickness differs depending on the molding method.conditions. For example, in the case of inflation molding, the thickness is approximately from 5 to 300 μm, and in the case of T-die molding, a film (or sheet) having a thickness of approximately from 5 μm to 5 mm can be obtained. Similarly, in the case of hollow containers as an example of the application in which the polyethylene-based resin composition of the present invention is intended to be mainly used, preferred examples of the molding method, molding conditions and used include, specifically, various hollow molding methods and blow molding methods and various applications, which are described in detail, for example, in JP-A-2004-18812, JP-A-2009-143079 and JP-A-2009-173889. Similarly, in the case of a pipe, a covering material, a cover, caps, a box and sundries as an example of the application of the polyethylene-based resin composition of the present invention, preferred examples of the molding method, molding conditions and used include, specifically, various molding methods and various applications, which are described in detail, for example, in JP-A-2007-2235, JP-A-2007-177183 and JP-A-2002-60559. Furthermore, as other applications, the polyethylene-based resin composition may be used as a modifier, for example, to enhance the moldability, enhance the mechanical strength, impart low-temperature resistance or impart low-temperature adhesiveness, by blending a small amount of the composition with another polyethylene-based resin or polyethylene-based resin composition or with a polyolefin-based resin such as polypropylene-based resin.

[III] Ethylene-Based Polymer

A second aspect of the present invention relates to an ethylene-based polymer having a developed long-chain branched structure and exhibiting excellent moldability. The second aspect of the present invention is described below item by item.

The ethylene-based polymer of the present invention satisfies all of the conditions (B-1′) to (B-8) described below.

III-1. Condition (B-1′)

MFR_(B) of the ethylene-based polymer in the present invention is from 0.001 to 200 g/10 min, preferably from 0.01 to 100 g/10 min, more preferably from 0.05 to 50 g/10 min, still more preferably from 0.1 to 50 g/10 min, and most preferably from 0.1 to 10 g/10 min. If MFR_(B) is less than 0.001 g/10 min. the ethylene-based polymer may be inferior in the moldability, particularly in the melt flowability and spreadability, and uniform mixing with another resin may become difficult, disadvantageously giving rise to production of an appearance failure such as gel, grain and fisheye or reduction in the impact strength or transparency. If MFR_(B) exceeds 200 g/10 min, the ethylene-based polymer or a composition obtained by mixing the polymer with another resin may be reduced in the mechanical strength such as impact strength, tear strength and tensile strength and this is not preferred. Incidentally, MFR indicates a value when measured under the same conditions as in the condition (A-1).

III-2. Condition (B-2″)

The density_(B) of the ethylene-based polymer in the present invention is from 0.880 to 0.970 g/cm³, preferably from 0.891 to 0.960 g/cm³, more preferably from 0.895 to 0.950 g/cm³, still more preferably from 0.900 to 0.934 g/cm³, and most preferably from 0.900 to 0.925 g/cm³. When the density_(B) is in this range, the ethylene-based polymer or its molded product is excellent in the balance between impact strength and stiffness and in the transparency. On the other hand, if the density_(B) is less than 0.880 g/cm³, the stiffness is reduced and when the product is a molded product having a small thickness, such as film and sheet, as well as various problems in using the product, a problem is disadvantageously brought about in the step of winding up the product or the post-processing step such as surface printing⋅lamination or when the product is a molded product having a large wall thickness, such as pipe and various containers, since the product is too soft and undergoes deformation, the wall thickness must be disadvantageously designed to be larger than necessary. In addition, the polymer is heavily sticky even at room temperature and difficult to handle in the blending step with another resin, disadvantageously giving rise to product sticking of the resin composition, and furthermore, the compatibility with the another resin may be reduced to deteriorate the impact strength or transparency due to phase separation. Also, if the density_(B) exceeds 0.970 g/cm³, the impact strength or transparency is deteriorated and this is not preferred. In the case of using the polymer as a modifier to enhance the strength of another resin, the density of the ethylene-based polymer in the present invention is preferably from 0.900 to 0.910 g/cm³. Incidentally, the density indicates a value when measured under the same conditions as the condition (A-2) above.

III-3. Condition (B-3)

The [Mw/Mn]_(B) of the ethylene-based polymer in the present invention is from 2.0 to 10.0, preferably from 2.0 to 6.0, more preferably from 2.5 to 5.6, still more preferably from 2.9 to 4.5, yet still more preferably from 3.2 to 4.0. If [Mw/Mn]_(B) is less than 2.0, the polymer may be reduced in the molding characteristics or may be difficult to mix with another resin and therefore, this should be avoided. If [Mw/Mn]_(B) exceeds 10.0, the ethylene-based polymer, the mixed resin composition with another resin or the molded product may lack the impact strength, be deteriorated in the transparency or become sticky, and this is not preferred. Incidentally, Mw/Mn indicates a value measured under the same conditions as the condition (A-3) above.

III-4. Condition (B-4′)

The [λmax(2.0)]_(B) of the ethylene-based polymer in the present invention is from 1.2 to 30.0, preferably from 1.5 to 20.0, more preferably from 2.0 to 10.0, still more preferably from 2.4 to 6.0, yet still more preferably from 3.0 to 5.0. If [λmax(2.0)]_(B) is less than 1.2, the ethylene-based polymer, the mixed resin composition with another resin or the molded product may lack the flowability or melt tension and be deteriorated in the molding characteristics. If [λmax(2.0)]_(B) exceeds 30.0, the flowability and melt tension may be excellent, but the ethylene-based polymer or the like may be disadvantageously reduced in the impact strength or transparency. Incidentally, λmax(2.0) indicates a value when measured under the same conditions as the condition (A-4) above. The effect of the elongational flow characteristics of the polyethylene on its moldability or mechanical properties of the molded product is as already described above in the condition (A-4) or condition (B-4).

III-5. Condition (B-5)

As regards the ethylene-based polymer in the present invention, the [λmax(2.0)]_(B)/[λmax(0.1)]_(B) defined in the condition (B-5) of Item 2.5 above is from 1.2 to 10.0, preferably from 1.3 to 5.0, more preferably from 1.4 to 4.0, still more preferably from 1.5 to 3.0. If [λmax(2.0)]_(B)/[λmax(0.1)]_(B) is less than 1.2, the ethylene-based polymer, the mixed resin composition with another resin or the molded product may be in a non-uniform molten state or may have a thermally unstable structure, or reduction in the impact strength or deterioration of the transparency may be caused due to strength anisotropy of the molded product, which is attributable to the presence of a significantly elongated long-chain branched structure, and this is not preferred. If [λmax(2.0)]_(B)/[λmax(0.1)]_(B) exceeds 10.0, the melt tension and flowability during molding may be excellent, but the ethylene-based polymer, the mixed resin composition with another resin or the molded product may be disadvantageously reduced in the impact strength or transparency.

III-6. Condition (B-6)

The ethylene-based polymer of the present invention is a polymer produced by an ethylene polymerization reaction using a catalyst containing a transition metal, and all of the matters described in the condition (B-6) of Item 2.6 apply.

III-7. Condition (B-7)

As regards the ethylene-based polymer in the present invention, the above-described g_(C)′ is from 0.30 to 0.70, and all of the matters described in the condition (B-7) of Item 2.7 above apply. The g_(C)′ value is preferably from 0.30 to 0.59, more preferably from 0.35 to 0.55, still more preferably from 0.35 to 0.50, yet still more preferably from 0.35 to 0.45. If the g_(C)′ value exceeds 0.70, the ethylene-based polymer, the mixed resin composition with another resin or the molded product may disadvantageously lack the moldability or transparency. If the g_(C)′ value is less than 0.30, the moldability of the ethylene-based polymer or the like may be improved, but the impact strength of the molded product may be reduced or the transparency may be deteriorated, and this is not preferred. Incidentally, the g_(C)′ value or the W_(C) value in the next paragraph indicates a value when measured under the same conditions as the condition (B-7) of Item 2.7 or the condition (B-8) of Item 2.8 above.

III-8. Condition (B-8)

As regards the ethylene-based polymer in the present invention, the above-described W_(C) is from 0.01 to 30.0%, and all of the matters described in the condition (B-8) of Item 2.8 above apply. The W_(C) value is more preferably from 0.02 to 10.0%, still more preferably from 0.05 to 8.0%, yet still more preferably from 0.10 to 6.0%, and most preferably from 0.11 to 4.0%. If the W_(C) value is less than 0.01%, the ethylene-based polymer or the mixed resin composition with another resin may be inferior in the moldability or the ethylene-based polymer or the like may lack the transparency, and this is not preferred. If the W_(C) value exceeds 30.0%, the ethylene-based polymer or the like may be enhanced in the melt tension out of the moldability, but the melt flowability may be excessively reduced to disadvantageously cause a problem in the production or molding of the ethylene-based polymer or the like. Furthermore, the impact strength or the transparency of the molded product may be deteriorated, and this is not preferred.

III-9. Condition (B-9)

The ethylene-based polymer in the present invention preferably further satisfies the following condition (B-9), in addition to the condition (B-1′) to the condition (B-8) defined in Items III-1 to III-8 above.

The condition (B-9) is that in the TREF measurement using an orthodichlorobenzene solvent, the content (W⁻¹⁵; unit: wt %) of components eluted at −15° C. is 2.0 wt % or less.

The W⁻¹⁵ value is preferably 0.9 wt % or less, more preferably 0.6 wt % or less, still more preferably 0.5 wt %, yet still more preferably 0.4 wt %, and most preferably 0.3 wt %. The lower limit of the W⁻¹⁵ value is preferably 0.0 wt %, that is, the components are not detected. If the W⁻¹⁵ value exceeds 2.0 wt %, the ethylene-based polymer, the mixed resin composition with another resin or the molded product may lack the impact strength, be deteriorated in the transparency or become sticky, and this is not preferred. Also, the compatibility with another resin may become bad, and this may disadvantageously give rise to deterioration of the impact strength or transparency. In the present invention, the W⁻¹⁵ value is measured by the following method.

A sample is dissolved in orthodichlorobenzene (containing 0.5 mg/mL BHT) at 140° C. to prepare a solution, and the solution is introduced into a TREF column at 140° C., then cooled to 100° C. at a temperature drop rate of 8° C./min, further cooled to −15° C. at a temperature drop rate of 4° C./min and held for 60 minutes. Thereafter, orthodichlorobenzene (containing 0.5 mg/mL BHT) as a solvent is flowed through the column at a flow rate of 1 mL/min to elute components dissolved in the orthodichlorobenzene at −15° C. in the TREF column for 10 minutes, and then the column temperature is raised linearly to 140° C. at a temperature rise rate of 100° C./hr to obtain an elution curve.

Apparatus:

(TREF Part)

TREF Column: Stainless steel-made column of 4.3 mmφ×150 mm

Column packing material: Inert glass bead of 100 μm

Heating system: Aluminum heating block

Cooling system: Peltier element (cooling of Peltier element is water cooling)

Temperature distribution: ±0.5° C.

Temperature regulator: programmable digital controller, KP 1000, manufactured by Chino Corporation

(Valve Part)

Heating system: Air bath oven

Temperature at measurement: 140° C.

Temperature distribution: ±1° C.

Valve: Six-way valve, four-way valve

(Sample Injection Part)

Injection system: Loop injection system

Injection amount: Loop size, 0.1 ml

Injection port heating system: Aluminum heating block

Temperature at measurement: 140° C.

(Detector Part)

Detector: Wavelength-fixed infrared detector, MIRAN 1A, manufactured by FOXBORO

Detection wavelength: 3.42 μm

High-temperature flow cell: Micro-flowcell for LC-IR, optical path length: 1.5 mm, window shape: oval of 2φ×4 mm, synthetic sapphire aperture plate

Temperature at measurement: 140° C.

(Pump Part)

Liquid delivery pump: SSC-3461 pump, manufactured by Senshu Kagaku

Measurement Conditions:

Solvent: o-Dichlorobenzene (containing 0.5 mg/mL of BHT)

Sample concentration: 5 mg/mL

Sample injection amount: 0.1 mL

Solvent flow velocity: 1 mL/min

[IV] Olefin Polymerization Catalyst Component of the Present Invention

A third aspect of the present invention relates to an olefin polymerization catalyst component containing a metallocene compound having a specific structure, which is useful for producing a metallocene-based polyolefin or metallocene-based polyethylene having a sufficient number of long-chain branches having an appropriate length, and an olefin polymerization catalyst containing the component. The third aspect of the present invention is described below item by item.

The olefin polymerization catalyst component of the present invention is an olefin polymerization catalyst component containing the following component (A-1b) and component (A-2b), or an olefin polymerization catalyst component containing the following component (Ac).

IV-1. Olefin Polymerization Catalyst Component Containing Component (A-1b) and Component (A-2b) of the Present Invention

A first embodiment of the olefin polymerization catalyst component of the present invention contains the components (A-1b) and (A-2b) defined below as essential components.

Component (A-1b): a metallocene compound represented by the following formula (1b):

[in formula (1b), M^(1b) represents any one transition metal of Ti, Zr and Hf; each of X^(1b) and X^(2b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1b) and Q^(2b) independently represents a carbon atom, a silicon atom or a germanium atom, each R^(1b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1b) may combine to form a ring together with Q^(1b) and Q^(2b); m^(b) is 0 or 1 and when m^(b) is 0, Q^(1b) is bonded directly to the conjugated 5-membered ring including R^(2b) and R^(3b); and each of R^(2b), R^(3b) and R^(4b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40 and out of R^(2b), R^(3b) and R^(4b), only either one pair of adjacent R^(3b) and R^(3b) and adjacent R^(2b) and R^(3b) may form a ring together with the carbon atoms to which the pair is bonded].

Component (A-2b): a metallocene compound represented by the following formula (2b):

[in formula (2b), M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b), R^(14b) and R^(15b) independently represents an atom or a group selected from a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, and a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that at least one member is not a hydrogen atom; each R^(13b), independently represents a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40; and out of R^(12b), R^(13b), R^(14b) and R^(15b), any only one pair of adjacent R^(12b) and R^(12b), adjacent R^(13b) and R^(13b) and adjacent R^(12b) and R^(13b) and any only one pair of adjacent R^(14b) and R^(14b), adjacent R^(15b) and R^(15b) and adjacent R^(14b) and R^(15b) may form a ring together with the carbon atoms to which the pair is bonded].

The components (A-1b) and (A-2b) (hereinafter, both are sometimes collectively referred to as component (Ab) or simply as Ab) are specifically described below.

IV-1(1). Component (A-1b)

The olefin polymerization catalyst component of the present invention is characterized by containing a metallocene compound represented by formula (1b) as the component (A-1b).

In formula (1b), M^(1b) of the metallocene compound represents Ti, Zr or Hf, preferably represents Zr or Hf, more preferably represents Zr.

Each of X^(1b) and X^(2b) specifically includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an i-propoxymethyl group, an n-butoxymethyl group, an i-butoxymethyl group, a tert-butoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an acetyl group, a 1-oxopropyl group, a 1-oxo-n-butyl group, a 2-methyl-1-oxopropyl group, a 2,2-dimethyl-1-oxo-propyl group, a phenylacetyl group, a diphenylacetyl group, a benzoyl group, a 2-methoxyphenyl group, a 3-methoxyphenyl group, a 4-methoxyphenyl group, a 2-furyl group, a 2-tetrahydrofuryl group, a dimethylaminomethyl group, a diethylaminomethyl group, a di-i-propylaminomethyl group, a bis(dimethylamino)methyl group, a bis(di-i-propylamino)methyl group, a (dimethylamino)(phenyl)methyl group, a methylimino group, an ethylimino group, a 1-(methylimino)ethyl group, a 1-(phenylimino)ethyl group, a 1-[(phenylmethyl)imino]ethyl group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, a phenoxy group, a dimethylamino group, a diethylamino group, a di-n-propylamino group, a di-i-propylamino group, a di-n-butylamino group, a di-i-butylamino group, a di-tert-butylamino group, and a diphenylamino group.

Specific preferred examples of X^(1b) and X^(2b) include a chlorine atom, a bromine atom, a methyl group, an n-butyl group, an i-butyl group, a methoxy group, an ethoxy group, an i-propoxy group, an n-butoxy group, a phenoxy group, a dimethylamino group, and a di-i-propylamino group. Among these specific examples, a chlorine atom, a methyl group and a dimethylamino group are more preferred.

Each of Q^(1b) and Q^(2b) independently represents a carbon atom, a silicon atom or a germanium atom and is preferably a carbon atom or a silicon atom.

Each R^(1b) independently includes, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, and a phenyl group. In the case where at least two R^(1b) are combined to form a ring together with Q^(1b) and Q^(2b), examples include a cyclobutylidene group, a cyclopentylidene group, a cyclohexylidene group, a silacyclobutyl group, a silacyclopentyl group, and a silacyclohexyl group.

When Q^(1b) or/and Q^(2b) are a carbon atom, specific preferred examples of R^(1b) include a hydrogen atom, a methyl group, an ethyl group, a phenyl group and a cyclobutylidene group, and when Q^(1b) or/and Q^(2b) are a silicon atom, specific preferred examples include a methyl group, an ethyl group, a phenyl group and a silacyclobutyl group.

Each of R^(2b), R^(3b) and R^(4b) specifically includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group.

Out of R^(2b), R^(3b) and R^(4b), any one or more members are preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, because the polymerization activity is particularly increased.

Specific preferred examples of R^(2b), R^(3b) and R^(4b) include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a 2-methylfuryl group, and a trimethylsilyl group. Among these specific examples, a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are more preferred, and a hydrogen atom, a methyl group, a tert-butyl group and a phenyl group are still more preferred.

Specific examples of the condensed cyclopentadienyl structure formed by adjacent two R^(3b) and a cyclopentadienyl moiety to which both R^(3b) are bonded, include the following partial structures (I) to (VI), and specific examples of the condensed cyclopentadienyl structure formed by adjacent R^(3b) and R^(2b) and a cyclopentadienyl moiety to which these R^(3b) and R^(2b) are bonded, are the same.

Among these specific examples, (I), (II) and (VI) are preferred. Also, R^(4b) may be substituted on these partial structures (I) to (VI).

In formula (1b), m^(b) is 0 or 1 and when m^(b) is 0, Q^(1b) is bonded directly to the conjugated 5-membered ring including R^(2b) and R^(3b).

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-1b) is preferably a compound represented by the following formula (3b):

[in formula (3b), M^(1b) represents any one transition metal of Ti, Zr and Hf; each of X^(1b) and X^(2b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1b) and Q^(2b) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1b) may combine to form a ring together with Q^(1b) and Q^(2b); m^(b) is 0 or 1 and when m^(b) is 0, Q^(1b) is bonded directly to the conjugated 5-membered ring including R^(2b) and R^(3b); and each of R^(2b), R^(3b) and R^(4b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40 and out of R^(2b), R^(3b) and R^(4b), only either one pair of adjacent R^(3b) and R^(3b) and adjacent R^(2b) and R^(3b) may form a ring together with the carbon atoms to which the pair is bonded].

In formula (3b), detailed definitions of M^(1b), X^(1b), X^(2b), Q^(1b), Q^(2b), R^(1b), R^(2b), R^(3b) and R^(4b) follow the definitions in the description of formula (1b) above.

In formula (3b), particularly when R^(3b) is a hydrogen atom, R^(2b) is preferably a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 6 and while one of two R^(4b) is a hydrogen atom, the remaining one is preferably a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, specifically, the remaining one R^(4b) is preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a 2-(trimethyl)silylfuryl group or the like: and R^(2b) is more preferably a hydrogen atom and while one of two R⁴ is a hydrogen atom, the remaining one is more preferably a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 20, or a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, specifically, the remaining one R^(4b) is more preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group or the like. The remaining one R^(4b) is specifically, still more preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group, and the remaining one R^(4b), is specifically, yet still more preferably a hydrogen atom, an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group.

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-1b) is more preferably a compound represented by the following formula (4b):

[in formula (4b), M^(1b) represents any one transition metal of Ti, Zr and Hf; each of X^(1b) and X^(2b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1b) and Q^(2b) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1b) may combine to form a ring together with Q^(1b) and Q^(2b); m^(b) is 0 or 1 and when m^(b) is 0, Q^(1b) is bonded directly to the conjugated 5-membered ring including R^(2b), R^(5b) and R^(6b); and each of R^(2b) and R^(4b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40 and R^(4b) does not form a ring together with the carbon atom to which R^(4b) is bonded; R^(5b) represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R^(5b) is bonded; R^(6b) is an atom or a group bonded to a carbon atom of R^(5b) and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and n^(b) represents an integer of 0 to 10 and when n^(b) is 2 or more, at least two R^(6b) may form a ring together with the carbon atoms to which R^(6b) are bonded].

In formula (4b), detailed definitions of M^(1b), X^(1b), X^(2b), Q^(1b), Q^(2b), R^(1b), R^(2b) and R^(4b) follow the definitions in the description of formula (1b) above. Specific examples of the condensed cyclopentadienyl structure formed by R^(5b) and a cyclopentadienyl moiety to which R^(5b) is bonded, include the partial structures (I) to (VI). Among these specific examples, (I), (III) and (VI) are preferred. Also, R^(6b) may be substituted on these partial structures (I) to (VI).

The substituent R^(6b) includes, in addition to a hydrogen atom, for example, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-tert-butylphenyl group, a 3,5-dimethylphenyl group, a 3,5-di-tert-butylphenyl group, a naphthyl group, an anthracenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 2,6-dichloro-4-trimethylsilylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group. R^(6b) may form a ring together with the carbon atom to which R^(6b) is bonded. Also, in formula (4b), particularly when R^(2b) is a hydrogen atom, all of two R^(4b) and R^(6b) are preferably a hydrogen atom or at least any one of two R^(4b) and R^(6b) is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, specifically, at least any one is preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a 2-(trimethyl)silylfuryl group or the like. In another preferred embodiment when R^(2b) in formula (4b) is a hydrogen atom, while either one of two R^(4b) is a hydrogen atom, the remaining one is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, specifically, the remaining one R^(4b) is preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a 2-(trimethyl)silylfuryl group or the like; and while either one of two R^(4b) is a hydrogen atom, the remaining one is more preferably a hydrocarbon group having a carbon number of 1 to 20 or a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, specifically, the remaining one R^(4b) is preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group or the like. The remaining one R^(4b) is specifically, still more preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group; and the remaining one R^(4b) is specifically, yet still more preferably an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group. Furthermore, in formula (4b), particularly when R^(4b) is a hydrogen atom, each of R^(2b) and R^(6b) is preferably any one of a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, and a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, specifically, each of R^(2b) and R^(6b) is preferably any one of a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a 2-(trimethyl)silylfuryl group and the like; and each of R^(2b) and R^(6b) is more preferably a hydrogen atom, a hydrocarbon group having a carbon number of 1 to 20, or a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, specifically, each of R^(2b) and R^(6b) is more preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group or the like. Each of R^(2b) and R^(6b) is specifically, still more preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, or a triphenylsilyl group, and each of R^(2b) and R^(6b) is specifically, yet still more preferably a hydrogen atom, an n-butyl group, an i-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group.

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-1b) is still more preferably a compound represented by the following formula (5b):

[in formula (5b), M^(1b) represents any one transition metal of Ti, Zr and Hf; each of X^(1b) and X^(2b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(1b) represents a carbon atom, a silicon atom or a germanium atom; each R^(1b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(1b) may combine with each other to form a ring together with Q^(1b); and each of R^(2b), R^(4b) and R^(6b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40 and R^(4b) does not form a ring together with the carbon atom to which R^(4b) is bonded; and R^(6b) may form a ring together with the carbon atoms to which R^(6b) is bonded].

In formula (5b), detailed definitions of M^(1b), X^(1b), X^(2b), Q^(1b), R^(1b), R^(2b), R^(4b) and R^(6b) follow the definitions in the description of formula (4b) above. The substituent R^(6b) is preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-tert-butylphenyl group, a 3,5-dimethylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group or a 2-(trimethyl)silylfuryl group, more preferably a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group or a phenyl group, still more preferably a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group or a trimethylsilyl group, yet still more preferably a hydrogen atom, a methyl group, a tert-butyl group or a phenyl group. In the case where the substituents R^(6b) form a ring together with the carbon atom to which the substituents are bonded, preferably, adjacent two R^(6b) form a 6-membered ring structure together with the carbon atoms to which these substituents are bonded; more preferably, both R^(6b) on the 4-position and the 5-position combine to form a 6-membered ring structure; and still more preferably, a benzindenyl ring structure is formed as a whole together with the indenyl ring to which the substituents are bonded.

In the olefin polymerization catalyst component of the present invention, specific examples of the metallocene compound as the component (A-1b) of the olefin polymerization catalyst component are illustrated below, but the present invention is not limited thereto. Incidentally, the number indicating the position of each substituent on the cyclopentadienyl ring, indenyl ring and azulenyl ring of metallocene compounds recited as specific examples of the component (A-1b) and the later-described (A-2b) is as shown in the following formulae.

(i) The metallocene compounds classified into a bridged Cp(Ind)Zr type include, for example, those shown in Table b-1 below.

TABLE b-1 (i) Bridged Cp(Ind)Zr Type

No. A1 A2 A3  1b dimethylsilylene Cl Cl  2b dimethylsilylene Me Me  3b dimethylsilylene Ph Ph  4b isopropylidene Cl Cl  5b silacyclobutyl Cl Cl  6b silacyclopentyl Cl Cl  7b silacyclohexyl Cl Cl  8b cyclobutylidene Cl Cl  9b cyclopentylidene Cl Cl 10b cyclohexylidene Cl Cl 11b dimethylgermirene Cl Cl

(ii) The metallocene compounds classified into a bridged Cp(3-substituted Ind)Zr type include, for example, those shown in Tables b-2 and b-3 below.

TABLE b-2 (ii) Bridged Cp(3-Substituted Ind)Zr Type

No. A1 A2 A3 A4 A5 12b dimethylsilylene 3-methyl — chloride chloride C 13b dimethylsilylene 3-methyl — methyl methyl C 14b isopropylidene 3-methyl — chloride chloride A 15b dimethylsilylene 3-ethyl — chloride chloride B 16b isopropylidene 3-ethyl — chloride chloride A 17b dimethylsilylene 3-n-propyl — chloride chloride B 18b isopropylidene 3-n-propyl — chloride chloride A 19b dimethylsilylene 3-i-propyl — chloride chloride B 20b isopropylidene 3-i-propyl — chloride chloride A 21b dimethylsilylene 3-n-butyl — chloride chloride 22b isopropylidene 3-n-butyl — chloride chloride 23b dimethylsilylene 3-tert-butyl — chloride chloride 24b cyclobutylidene 3-tert-butyl — chloride chloride 25b dimethylsilylene 3-tert-butyl — methyl methyl 26b isopropylidene 3-tert-butyl — chloride chloride 27b dimethylsilylene 3-n-pentyl — chloride chloride 28b dimethylsilylene 3-n-hexyl — chloride chloride 29b dimethylsilylene 3-cyclohexyl — chloride chloride B 30b dimethylsilylene 3-phenyl — chloride chloride 31b dimethylsilylene 3-benzyl — chloride chloride B 32b dimethylsilylene 3-tolyl — chloride chloride 33b dimethylsilylene 3-trimethylsilyl — chloride chloride A 34b dimethylsilylene 3-chlorophenyl — chloride chloride A 35b dimethylsilylene 3-fluorophenyl — chloride chloride B 36b dimethylsilylene 3-(5-methyl-2-furyl) — chloride chloride C 37b dimethylsilylene — 4-methyl chloride chloride B 38b dimethylsilylene — 5-methyl chloride chloride B 39b dimethylsilylene — 6-methyl chloride chloride C 40b dimethylsilylene 3-methyl 4-methyl chloride chloride 41b dimethylsilylene 3-tert-butyl 4-methyl chloride chloride C 42b dimethylsilylene — 4-phenyl chloride chloride C 43b dimethylsilylene — 4-(4-methylphenyl) chloride chloride C 44b dimethylsilylene — 4-(4-tert-butylphenyl) chloride chloride 45b dimethylgermirene 3-methyl — chloride chloride

TABLE b-3 (ii) Bridged Cp(3-substituted Ind)Zr Type (continued) No. A1 A2 A3 A4 A5 46b dimethylgermirene 3-ethyl — chloride chloride 47b dimethylgermirene 3-i-propyl — chloride chloride 48b dimethylgermirene 3-n-butyl — chloride chloride 49b dimethylgermirene 3-tert-butyl — chloride chloride 50b diethylsilylene — — chloride chloride C 51b diethylsilylene 3-methyl — chloride chloride B 52b diethylsilylene 3-ethyl — chloride chloride B 53b diethylsilylene 3-i-propyl — chloride chloride 54b diethylsilylene 3-n-butyl — chloride chloride 55b diethylsilylene 3-tert-butyl — chloride chloride 56b di-n-butylsilylene — — chloride chloride C 57b di-n-butylsilylene 3-methyl — chloride chloride B 58b di-n-butylsilylene 3-ethyl — chloride chloride B 59b di-n-butylsilylene 3-i-propyl — chloride chloride 60b di-n-butylsilylene 3-n-butyl — chloride chloride 61b di-n-butylsilylene 3-tert-butyl — chloride chloride 62b diphenylsilylene — — chloride chloride 63b diphenylmethylene — — chloride chloride C 64b diphenylsilylene 3-methyl — chloride chloride B 65b diphenylsilylene 3-ethyl — chloride chloride B 66b diphenylsilylene 3-i-propyl — chloride chloride 67b diphenylsilylene 3-n-butyl — chloride chloride 68b diphenylsilylene 3-tert-butyl — chloride chloride C 69b dimethylsilylene — benz[e] chloride chloride C 70b dimethylsilylene — dibenzo chloride chloride 71b dimethylsilylene — azulenyl chloride chloride C 72b dimethylsilylene — 4-methylazulenyl chloride chloride C 73b dimethylsilylene — 4-phenylazulenyl chloride chloride B 74b dimethylsilylene — 5,6-dimethyl chloride chloride C 75b dimethylsilylene — benz[f] chloride chloride 76b dimethylsilylene — 6,7-dihydroindacenyl chloride chloride 77b dimethylsilylene — 5,5,7,7-tetramethyl- chloride chloride 6,7-dihydroindacenyl 78b dimethylsilylene — 5,6,7,8-tetra- chloride chloride hydrobenz[f] 79b dimethylsilylene — 5,6,7,8-tetrahydro- chloride chloride 5,5,8,8-tetramethyl- benz[f]

(iii) The metallocene compounds classified into a bridged (3-substituted Cp)(Ind)Zr type include, for example, those shown in Table b-4 below.

TABLE 20 [Table b-4] (iii) Bridged (3-Substituted Cp) (Ind) Zr Type

No. A1 A2 A3 A4 A5 80b dimethylsilylene 4-methyl — chloride chloride C 81b dimethylsilylene 4-ethyl — chloride chloride C 82b dimethylsilylene 4-i-propyl — chloride chloride C 83b dimethylsilylene 4-n-butyl — chloride chloride C 84b dimethylsilylene 4-i-butyl — chloride chloride C 85b dimethylsilylene 4-tert-butyl — chloride chloride C 86b dimethylsilylene 4-tert-butyl — bromide bromide C 87b dimethylsilylene 4-tert-butyl — methyl methyl C 88b dimethylsilylene 4-tert-butyl — phenyl phenyl C 89b dimethylsilylene 4-tert-butyl 4,5,6,7- chloride chloride C tetrahydro 90b dimethylsilylene 4-tert-butyl azulenyl chloride chloride C 91b dimethylsilylene 4- — chloride chloride C trimethylsilyl 92b dimethylsilylene 4-(2- — chloride chloride A bromoethyl) 93b dimethylsilylene 4-(2- — chloride chloride C trimethyl- silylfuryl) 94b dimethylsilylene 4-phenyl — chloride chloride C 95b dimethylsilylene 4-(4-methyl — chloride chloride C phenyl) 96b isopropylidene 4-tert-butyl — chloride chloride A 97b dimethyl- 4-tert-butyl — chloride chloride germirene

(iv) The metallocene compounds classified into a bridged (4-substituted Cp)(3-substituted Ind)Zr type include, for example, those shown in Table b-5 below.

TABLE 21 [Table b-5] (iv) Bridged (4-Substituted Cp) (3-Substituted Ind) Zr Type

No. A1 A2 A3 A4 A5 A6 98b dimethylsilylene 4-tert- 3-methyl — chloride chloride butyl 99b dimethylsilylene 4-tert- 3-tert- — chloride chloride butyl butyl 100b dimethylsilylene 4-tert- 3-tert- — chloride chloride butyl butyl 101b dimethylsilylene 4-tert- — 4-phenyl chloride chloride butyl 102b dimethylsilylene 3,4- 3-tert- — chloride chloride dimethyl butyl 103b isopropylidene 4-tert- 3-n-butyl — chloride chloride butyl 104b dimethylsilylene 4-tert- — 4- chloride chloride butyl phenyl- azulenyl

(v) The metallocene compounds classified into a bridged bisCpZr type include, for example, those shown in Table b-6 below.

TABLE 22 [Table b-6] (v) Bridged bisCpZr Type

No. A1 A2 A3 105b dimethylsilylene chloride chloride 106b dimethylsilylene methyl methyl 107b dimethylsilylene phenyl phenyl 108b dimethylsilylene benzyl benzyl 109b isopropylidene chloride chloride 110b silacyclobutyl chloride chloride 111b dimethylgermirene chloride chloride

(vi) The metallocene compounds classified into a bridged Cp(3-substituted Cp)Zr type include, for example, those shown in Table b-7 below.

TABLE 23 [Table b-7] (vi) Bridged Cp (3-substituted Cp) Zr Type

No. A1 A2 A3 A4 112b dimethylsilylene 3-n-propyl chloride chloride C 113b dimethylsilylene 3-tert-butyl chloride chloride C 114b dimethylsilylene 3-cyclohexyl chloride chloride C 115b dimethylsilylene 3-biphenyl chloride chloride C 116b dimethylsilylene 3-(4-methylphenyl) chloride chloride C 117b dimethylsilylene 3-(5-methyl-2-furyl) chloride chloride C 118b dimethylsilylene 3-tert-butyl-4-methyl chloride chloride B 119b dimethylsilylene 3-tert-butyl-4-ethyl chloride chloride B 120b isopropylidene 3-tert-butyl chloride chloride A 121b dimethylgermirene 3-tert-butyl chloride chloride

(vii) The metallocene compounds classified into a bridged bis(3-substituted Cp)Zr type include, for example, those shown in Table b-8 below.

TABLE 24 [Table b-8] (vii) Bridged bis(3-substituted Cp)Zr Type

No. A1 A2 A3 A4 A5 122b dimethylsilyiene 3-tert-butyl 3-tert-butyl chloride chloride 123b dimethylsilylene 3-tert-butyl 3-tert-butyl methyl methyl 124b dimethylsilylene 3-tert-butyl 3-tert-butyl phenyl phenyl 125b isopropylidene 3-tert-butyl 3-tert-butyl chloride chloride 126b silacyclobutyl 3-tert-butyl 3-tert-butyl chloride chloride 127b dimethylgermirene 3-tert-butyl 3-tert-butyl chloride chloride 128b dimethylsilylene 3-allyl 3-allyl chloride chloride 129b dimethylsilylene 3-trimethylsilyl 3-trimethylsilyl chloride chloride 130b dimethylsilylene 3-ethyl-4-methyl 3-ethyl-4-methyl chloride chloride 131b dimethylsilylene 3-tert-butyl-4- 3-tert-butyl-4- chloride chloride methyl methyl 132b dimethylsilylene 3-(2-bromoethyl) 3-(2-bromoethyl) chloride chloride 133b dimethylsilylene 3-(4-chlorophenyl) 3-(4-chlorophenyl) chloride chloride 134b dimethylsilylene 3-benzyl 3-benzyl chloride chloride 135b dimethylsilylene 3-(5-methyl-2- 3-(5-methyl-2- chloride chloride furyl) furyl) 136b dimethylsilylene 3-tert-butyl 3-methyl chloride chloride 137b dimethylsilylene 3-tert-butyl 4-tert-butyl chloride chloride 138b dimethylsilylene 3-methyl 4-phenyl chloride chloride 139b dimethylsilylene 3, 4-dimethyl 3-tert-butyl chloride chloride 140b dimethylsilylene 3,4-dimethyl 3-(2-methylfuryl) chloride chloride 141b dimethylsilylene 3-methyl-4-phenyl 3-tert-butyl-4- chloride chloride ethyl

The metallocene compound also includes, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Furthermore, in using these metallocene compounds as the component (A-1b), two or more thereof may be also used.

In specific compounds exemplified above, in terms of excellent performance in both polymerization activity and moldability, preferred metallocene compounds as the component (A-1b) are denoted by “A”, more preferred compounds are denoted by “B”, and still more preferred compounds are denoted by “C”.

Synthesis examples for the metallocene compound as the component (A-1b) according to the present invention are described below, but the present invention is not limited to these synthesis methods in particular.

For example, there are a method where an indene compound is lithiated, then reacted with a dichlorosilane compound and subsequently reacted with cyclopentadienyl lithium to obtain a ligand and the obtained ligand is reacted with a tetrakis(alkylamido)zirconium and then with trimethylsilyl chloride, and a method where the obtained ligand is lithiated and subsequently reacted with zirconium tetrachloride.

IV-1(2). Component (A-2b)

The olefin polymerization catalyst component of the present invention is characterized by containing a metallocene compound represented by formula (2b) as the component (A-2b).

In formula (2b), M^(2b) of the metallocene compound represents Ti, Zr or Hf, preferably represents Zr or Hf, more preferably represents Zr.

Each of X^(11b) and X^(12b) specifically includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an i-propoxymethyl group, an n-butoxymethyl group, an i-butoxymethyl group, a tert-butoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an acetyl group, a 1-oxopropyl group, a 1-oxo-n-butyl group, a 2-methyl-1-oxopropyl group, a 2,2-dimethyl-1-oxo-propyl group, a phenylacetyl group, a diphenylacetyl group, a benzoyl group, a 2-methoxyphenyl group, a 3-methoxyphenyl group, a 4-methoxyphenyl group, a 2-furyl group, a 2-tetrahydrofuryl group, a dimethylaminomethyl group, a diethylaminomethyl group, a di-i-propylaminomethyl group, a bis(dimethylamino)methyl group, a bis(di-i-propylamino)methyl group, a (dimethylamino)(phenyl)methyl group, a methylimino group, an ethylimino group, a 1-(methylimino)ethyl group, a 1-(phenylimino)ethyl group, a 1-[(phenynlmethyl)imino]ethyl group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, a phenoxy group, a dimethylamino group, a diethylamino group, a di-n-propylamino group, a di-i-propylamino group, a di-n-butylamino group, a di-i-butylamino group, a di-tert-butylamino group, and a diphenylamino group.

Specific preferred examples of X^(11b) and X^(12b), each independently, include a chlorine atom, a bromine atom, a methyl group, an n-butyl group, an i-butyl group, a methoxy group, an ethoxy group, an i-propoxy group, an n-butoxy group, a phenoxy group, a dimethylamino group, and a di-i-propylamino group. Among these specific examples, a chlorine atom, a methyl group and a dimethylamino group are more preferred.

Q^(11b) represents a carbon atom, a silicon atom or a germanium atom and is preferably a carbon atom or a silicon atom.

Each R^(11b) independently includes, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, and a phenyl group. In the case where R^(11b) forms a ring together with Q^(11b), examples include a cyclobutylidene group, a cyclopentylidene group, a cyclohexylidene group, a silacyclobutyl group, a silacyclopentyl group, and a silacyclohexyl group.

When Q^(11b) is a carbon atom, specific preferred examples of R^(11b) include a hydrogen atom, a methyl group, an ethyl group, a phenyl group and a cyclobutylidene group, and when Q^(11b) is a silicon atom, specific preferred examples include a methyl group, an ethyl group, a phenyl group and a silacyclobutyl group.

Each of R^(12b), R^(14b) and R^(15b) specifically includes an element or a group selected from, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group, provided that at least one member thereof is not a hydrogen atom; specifically, each is preferably an element or a group selected from a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group and a 2-(trimethyl)silyl group, provided that at least one member thereof is not a hydrogen atom; and specifically, each is more preferably an element or a group selected from a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group, provided that at least one member thereof is not a hydrogen atom. The member that is not a hydrogen atom is preferably at least one member out of R^(12b) located on the 2-position of the cyclopentadienyl ring, R^(14b) located on the same 2-position and two R^(15b); the member that is not a hydrogen atom is more preferably at least one member out of R^(12b) located on the 2-position of the cyclopentadienyl ring and two R^(15b); and the member that is not a hydrogen atom is still more preferably at least one member out of R^(12b) located on the 2-position of the cyclopentadienyl ring and R^(15b) located on the same 2-position.

Each R^(13b) independently includes, for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group; preferably, each is independently a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group or a 2-(trimethyl)silyl group; and more preferably, each is independently an element or a group selected from a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group.

In formula (2b), adjacent R^(12b) and R^(12b) may form a condensed cyclopentadienyl structure of the partial structure (I) to (VI) described in the component (A-1b), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), together with the carbon atom on the cyclopentadienyl ring, to which those members are bonded, but in this case, the ring structure above is not formed between adjacent R^(13b) and R^(13b) and between adjacent R^(12b) and R^(13b). Similarly, adjacent R^(13b) and R^(13b) may form a condensed cyclopentadienyl structure of (I) to (VI), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), but in this case, the ring structure above is not formed between adjacent R^(12b) and R^(12b) and between adjacent R^(12b) and R^(13b). Also, similarly, adjacent R^(12b) and R^(13b) may form a condensed cyclopentadienyl structure of (I) to (VI), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), but in this case, the ring structure above is not formed between adjacent R^(12b) and R^(12b) and between adjacent R^(13b) and R^(13b).

Furthermore, in formula (2b), adjacent R^(14b) and R^(14b) may form a condensed cyclopentadienyl structure of (I) to (VI), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), but in this case, the ring structure above is not formed between adjacent R^(15b) and R^(15b) and between adjacent R^(14b) and R^(15b). Similarly, adjacent R^(15b) and R^(15b) may form a condensed cyclopentadienyl structure of (I) to (VI), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), but in this case, the ring structure above is not formed between adjacent R^(14b) and R^(14b) and between adjacent R^(14b) and R^(15b). Also, similarly, adjacent R^(14b) and R^(15b) may form a condensed cyclopentadienyl structure of (I) to (VI), preferably a condensed cyclopentadienyl structure of (I), (III) or (VI), but in this case, the ring structure above is not formed between adjacent R^(14b) and R^(14b) and between adjacent R^(15b) and R^(15b).

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-2b) is preferably a compound represented by the following formula (6b):

[in formula (6b), M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b) and R^(14b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that R^(12b) and R^(14b) do not form a ring together with the carbon atoms to which these members are bonded; each of R^(16b) and R^(17b) independently represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R^(16b) or R^(17b) is bonded; each of R^(18b) and R^(19b) is an atom or a group bonded to a carbon atom of R^(16b) or R^(17b) and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40; each of p^(b) and q^(b) independently represents an integer of 0 to 10 and when each of p^(b) and q^(b) is 2 or more, at least two R^(18b) or at least two R^(19b) may form a ring together with the carbon atoms to which these members are bonded].

In formula (6b), detailed definitions of M^(2b), X^(11b), X^(12b), Q^(11b) and R^(11b) follow the definitions in the description of formula (2b) above.

In formula (6b), each of R^(12b) and R^(14b) specifically includes an element or a group selected from, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group; specifically, each is preferably an element or a group selected from a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group and a 2-(trimethyl)silyl group; and specifically, each is more preferably an element or a group selected from a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group. Also, at least one member out of R^(12b) located on the 2-position of the cyclopentadienyl ring and R^(14b) located on the same 2-position is more preferably a group selected from a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group, still more preferably a group selected from a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group.

Specific examples of the condensed cyclopentadienyl structure formed by R^(16b) and a cyclopentadienyl moiety to which R^(16b) is bonded, include the partial structures (I) to (VI). Among these specific examples, (I), (III) and (VI) are preferred. Also, R^(18b) may be substituted on these partial structures (I) to (VI).

The substituent R^(18b) includes, in addition to a hydrogen atom, for example, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-tert-butylphenyl group, a 3,5-dimethylphenyl group, a 3,5-di-tert-butylphenyl group, a naphthyl group, an anthracenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 2,6-dichloro-4-trimethylsilylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group. R^(18b) may form a ring together with the carbon atom to which R^(18b) is bonded.

In formula (6b), each of R^(17b) and R^(19b) is also independently defined, similarly to R^(16b) and R^(18b).

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-2b) is also preferably a compound represented by the following formula (7b):

[in formula (7b). M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b), R^(14b) and R^(15b) independently represents an atom or a group selected from a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, and a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that at least one of R^(12b), R^(14b) and R^(15b) located on the 2-position and 5-position of both cyclopentadienyl rings is not a hydrogen atom and R^(12b), R^(14b) and R^(15b) do not form a ring together with the carbon atoms to which these members are bonded: R^(16b) represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R^(16b) is bonded; R^(18b) is an atom or a group bonded to a carbon atom of R^(16b) and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40; p^(b) represents an integer of 0 to 10 and when p^(b) is 2 or more, at least two R^(18b) may form a ring together with the carbon atoms to which these members are bonded].

In formula (7b), detailed definitions of M^(2b), X^(11b), X^(12b), Q^(11b), R^(11b), R^(16b) and R^(18b) follow the definitions in the description of formula (6b) above.

In formula (7b), each of R^(12b), R^(14b) and R^(15b) specifically includes an element or a group selected from, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, a phenyldimethylsilyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, and a 2-(trimethyl)silylfuryl group, provided that at least one of R^(12b), R^(14b) and R^(15b) located on the 2-position and 5-position of both cyclopentadienyl rings is not a hydrogen atom; specifically, each is preferably an element or a group selected from a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group and a 2-(trimethyl)silyl group, provided that at least one of R^(12b). R^(14b) and R^(15b) located on the 2-position and 5-position of both cyclopentadienyl rings is not a hydrogen atom; and specifically, each is more preferably an element or a group selected from a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group, provided that at least one of R^(12b), R^(14b) and R^(15b) located on the 2-position and 5-position of both cyclopentadienyl rings is not a hydrogen atom. In formula (7b), R^(12b) located on the 2-position of the cyclopentadienyl ring is more preferably an atom or a group selected from a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, and a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40; still more preferably a group selected from a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group, a furyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group: and most preferably a group selected from a methyl group, an n-butyl group, a tert-butyl group, a phenyl group, a trimethylsilyl group, a 2-methylfuryl group and a 2-(trimethyl)silylfuryl group. In formula (7b), R^(12b), R^(14b) and R^(15b) do not form a ring together with the carbon atoms to which these members are bonded.

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-2b) is more preferably a compound represented by the following formula (8b):

[in formula (8b), M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b), R^(14b), R^(18b) and R^(19b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that R^(12b) and R^(14b) do not form a ring together with the carbon atoms to which these members are bonded; and R^(18b) and R^(19b) may form a ring together with the carbon atoms to which these members are bonded].

In formula (8b), detailed definitions of M^(2b), X^(11b), X^(12b), Q^(11b), R^(11b), R^(12b), R^(14b), R^(18b) and R^(19b) follow the definitions in the description of formula (6b) above.

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-2b) is also more preferably a compound represented by the following formula (9b):

[in formula (9b), M^(2b) represents any one transition metal of Ti, Zr and Hf; each of X^(11b) and X^(12b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; Q^(11b) represents a carbon atom, a silicon atom or a germanium atom; each R^(11b) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and two R^(11b) may combine with each other to form a ring together with Q^(11b); each of R^(12b), R^(14b) and R^(15b) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a sulfur atom and having a carbon number of 1 to 40, or a silyl group substituted with a hydrocarbon group having a carbon number of 1 to 40, provided that at least one of R^(12b) located on the 2-position of the indenyl ring and R^(14b) and R^(15b) located on the 2-position and 5-position of the cyclopentadienyl ring is not a hydrogen atom and R^(12b), R^(14b) and R^(15b) do not form a ring together with the carbon atoms to which these members are bonded; and R^(18b) may form a ring together with the carbon atom to which R^(18b) is bonded].

In formula (9b), detailed definitions of M^(2b), X^(11b), X^(12b), Q^(11b), R^(11b), R^(12b), R^(14b), R^(15b) and R^(18b) follow the definitions in the description of formula (6b) above.

As the olefin polymerization catalyst component according to the present invention, the metallocene compound of the component (A-2b) is, out of the compounds represented by formulae (2b) and (6b) to (9b), preferably a compound where R^(12b) as a substituent on the 2-position of the conjugated 5-membered ring is a halogen atom, an alkyl group having a carbon number of 1 to 6, an alkoxy group having a carbon number of 1 to 6, a phenoxy group having a carbon number of 6 to 12, an alkenyl group having a carbon number of 2 to 8, a halogen-containing alkyl group having a carbon number of 1 to 6, an aryl group having a carbon number of 6 to 18, a halogen-containing aryl group having a carbon number of 6 to 18, an alkyl group having a carbon number of 1 to 3 and containing a trialkylsilyl group with the alkyl group having a carbon number of 1 to 3, a silyl group containing a hydrocarbon group having a carbon number of 1 to 6, an oxygen-containing heterocyclic group or a sulfur-containing heterocyclic group. Such a preferred substituent R^(12b) on the 2-position specifically includes, for example, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group; specifically, is more preferably a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group or a trimethylsilyl group: and specifically, is still more preferably a methyl group, an n-butyl group, a tert-butyl group, a phenyl group or a trimethylsilyl group.

Other specific examples of the chemical structure for the preferred substituent R^(12b) on the 2-position include an oxygen-containing heterocyclic group and a sulfur-containing heterocyclic group, represented by the following formula (10b):

In formula (10b), R^(21b) and R^(22b) may be the same as or different from each other and is a hydrogen atom, a halogen atom, an alkyl group having a carbon number of 1 to 6, an alkoxy group having a carbon number of 1 to 6, an alkenyl group having a carbon number of 2 to 8, a halogen-containing alkyl group having a carbon number of 1 to 6, an aryl group having a carbon number of 6 to 18, a halogen-containing aryl group having a carbon number of 6 to 18, an alkyl group having a carbon number of 1 to 3 and containing a trialkylsilyl group with the alkyl group having a carbon number of 1 to 3, or a silyl group containing a hydrocarbon group having a carbon number of 1 to 6. Both of R^(21b) and R^(22b) may together constitute a 6- or 7-membered ring, and the 6- or 7-membered ring may contain an unsaturated bond.

Here, specific examples of the alkyl group having a carbon number of 1 to 6 include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a s-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclopropyl group, a cyclopentyl group, and a cyclohexyl group.

Specific examples of the alkoxy group having a carbon number of 1 to 6 include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, and a phenoxy group. The halogen atom includes a chlorine atom, a bromine atom, an iodine atom, and a fluorine atom. Specific examples of the alkenyl group having a carbon number of 2 to 8 include a vinyl group, a propenyl group, an allyl group, a butenyl group, and a cyclohexenyl group. Furthermore, the halogen atom in the halogen-containing alkyl group having a carbon number of 1 to 6 includes a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. The halogen-containing alkyl group having a carbon number of 1 to 6 is a group where a hydrogen atom on the skeleton of an alkyl group having a carbon number of 1 to 6 is substituted for by a halogen atom, and specific examples thereof include fluoromethyl, difluoromethyl, trifluoromethyl, chloromethyl, dichloromethyl, trichloromethyl, bromomethyl, dibromomethyl, tribromomethyl, iodomethyl, 2,2,2-trifluoroethyl, 2,2,1,1-tetrafluoroethyl, pentafluoroethyl, pentachloroethyl, pentafluoropropyl, nonafluorobutyl, 5-chloropentyl, 5,5,5-trichloropentyl, 5-fluoropentyl, 5,5,5-trifluoropentyl, 6-chlorohexyl, 6,6,6-trichlorohexyl, 6-fluorohexyl, and 6,6,6-trifluorohexyl. The aryl group having a carbon number of 6 to 18 may be substituted with a hydrocarbon group having a carbon number of 1 to 6, and specific examples include phenyl, tolyl, dimethylphenyl, ethylphenyl, trimethylphenyl, tert-butylphenyl, biphenyl, 1-naphthyl, 2-naphthyl, acenaphthyl, phenanthryl, and anthryl. Specific examples of the halogen-containing aryl group having a carbon number of 6 to 18 are those where a hydrogen atom of the above-described aryl group having a carbon number of 6 to 18 is substituted for by a halogen atom, and specific examples include a 2-, 3- or 4-substituted fluorophenyl, a 2-, 3- or 4-substituted chlorophenyl, a 2-, 3- or 4-substituted bromophenyl, a 2,4-, 2,5-, 2,6- or 3,5-substituted difluorophenyl, a 2,4-, 2,5-, 2,6- or 3,5-substituted dichlorophenyl, a 2,4,6-, 2,3,4-, 2,4,5- or 3,4,5-substituted trifluorophenyl, a 2,4,6-, 2,3,4-, 2,4,5- or 3,4,5-substituted trichlorophenyl, pentafluorophenyl, pentachlorophenyl, 3,5-dimethyl-4-chlorophenyl, and 3,5-dichloro-4-biphenyl. The alkyl group having a carbon number of 1 to 3 and containing a trialkylsilyl group with the alkyl group having a carbon number of 1 to 3 is a group where a hydrogen atom of an alkyl group having a carbon number of 1 to 3 is substituted for by a trialkylsilyl group containing an alkyl group having a carbon number of 1 to 3, which may be different, and specific examples thereof include a trimethylsilylmethyl and a trimethylsilylethyl. The silyl group containing a hydrocarbon group having a carbon number of 1 to 6 is a substituent where three hydrocarbon group having a carbon number of 1 to 6, which may be different, are substituted on silicon. The hydrocarbon having a carbon number of 1 to 6 includes an alkyl group having a carbon number of 1 to 6, alkoxy group having a carbon number of 1 to 6, an alkenyl group having a carbon number of 2 to 8, a halogen-containing alkyl group having a carbon number of 1 to 6, and a phenyl group, which are described above, and a substituent may be substituted on the phenyl group. The silyl group containing a hydrocarbon group specifically includes trimethylsilyl, triethylsilyl, tri-n-butylsilyl, tert-butyldimethylsilyl, trivinylsilyl, triallylsilyl, and triphenylsilyl.

Each of R^(21b) and R^(22b) is independently, preferably hydrogen atom, a halogen atom, an alkyl group having a carbon number of 1 to 6, an aryl group having a carbon number of 6 to 18, or a silyl group containing a hydrocarbon group having a carbon number of 1 to 6. In the case where R^(21b) is a hydrogen atom, the synthesis yield is low, and R^(21b) is preferably a substituent except for a hydrogen atom. R^(21b) is more preferably an alkyl group having a carbon number of 1 to 6, an aryl group having a carbon number of 6 to 18, or a silyl group containing a hydrocarbon group having a carbon number of 1 to 6. R^(22b) is more preferably a hydrogen atom or an alkyl group having a carbon number of 1 to 6. As for specific preferred substituents, R^(21b) is a methyl group, an ethyl group, a tert-butyl group, a cyclohexyl group, a phenyl group, a trimethylsilyl group or a triphenylsilyl group, and R^(22b) is a hydrogen atom, a methyl group or an ethyl group.

Both of R^(21b) and R^(22b) may together constitute a 6- or 7-membered ring, and the 6- or 7-membered ring may contain an unsaturated bond. As for specific substitution, the substituent on the 2-position of the indene ring includes a benzofuryl group and a benzothienyl group.

In the olefin polymerization catalyst component of the present invention, specific examples of the metallocene compound as the component (A-2b) of the olefin polymerization catalyst component are recited below, but the present invention is not limited thereto.

(i) Examples include: metallocene compounds classified into the bridged Cp₂Zr type; out of compounds recited in the above-described literatures such as JP-A-2-76887, JP-A-3-12406, JP-A-3-12407, JP-A-3-12407, JP-A-11-315089, JP-A-2009-143901 and JP-T-2005-507961, bridged bis(alkyl-substituted cyclopentadienyl)zirconium compounds belonging to formula (2b); and out of zirconium compounds having a cyclopentadienyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group described in JP-T-2002-535339 and the like and belonging to formula (2b), bridged bis(alkyl-substituted cyclopentadienyl)zirconium compounds belonging to formula (2b).

Metallocene compounds classified into the bridged Cp₂Zr type are shown in Table b-9 and Table b-10.

TABLE 25 [Table b-9] (i) Bridged Cp2Zr Type

No. A1 A2 A3 A4 A5 142b Me2Si 2,3-Me2 2-Me Cl Cl A B C 143b Me2Si 2,3-Me2 3-Me Cl Cl B 144b Me2Si 2,3-Me2 4-Me Cl Cl B 145b Me2Si 2,3-Me2 5-Me Cl Cl B C 146b Me2Si 2,3-Me2 2-Et Cl Cl B C 147b Me2Si 2,3-Me2 3-Et Cl Cl B 148b Me2Si 2,3-Me2 2-iPr Cl Cl B C 149b Me2Si 2,3-Me2 3-iPr Cl Cl B 150b Me2Si 2,3-Me2 2-nBu Cl Cl B C 151b Me2Si 2,3-Me2 3-tBu Cl Cl B 152b Me2Si 2,3-Me2 3-Ph Cl Cl B 153b Me2Si 2,4,5-Me3 — Cl Cl 154b Me2Si 2-Et-4,5-Me2 — Cl Cl 155b Me2Si 2-Et-4-Bu-5-Me — Cl Cl 156b Me2Si 2,4,5-Me3 2-Me Cl Cl B C 157b Me2Si 2-Et-4,5-Me2 3-tBu Cl Cl A B 158b Me2Si 2,3,4,5-Me4 — Cl Cl A 159b Me2Si 2,3,4,5,-Me4 2-Me Cl Cl A B C 160b Me2Si 2,3-Me2 2,3-Me2 Cl Cl A B C 161b Me2Si 2,3,-Me2 2,3,-Me2 Br Br A B C 162b Me2Si 2,3-Me2 2,3-Me2 Me Me A B C 163b Me2Si 2,3,-Me2 2,3,-Me2 Ph Ph A B C 164b Me2Si 2,4,5-Me3 2,4,5-Me3 Cl Cl A B C 165b Me2Si 2-Et-4,5-Me2 2-Et-4,5- Cl Cl A B C Me2

TABLE b-10 (i) Bridged Cp2Zr Type (continued) No. A1 A2 A3 A4 A5 166b Me2Si 2-Et-4-Bu-5-Me 2-Et-4-Bu-5-Me Cl Cl A B C 167b Me2Si 2,3,4-Me3 2,3,4-Me3 Cl Cl A B C 168b Me2Si 2-Et-3,5-Me2 2-Et-3,5-Me2 Cl Cl A B C 169b Me2Si 2,3,4,5-Me4 2,3,4,5-Me4 Cl Cl A B C 170b Me2Si 2,3,5-Me3 2,3,5-Me3 Cl Cl A B C 171b Me2Si TMS 2-Ind Cl Cl A B 172b Me2Si 1-Ind 2-Ind Cl Cl A B 173b Me2Si 3-(2-furyl)-2,5-dimethyl 3-(2-furyl)-2,5-dimethyl Cl Cl A B C 174b Me2Si 2-(2-furyl)-3,5-dimethyl 2-(2-furyl)-3,5-dimethyl Cl Cl A B C 175b Me2Si 2-(2-furyl)-4,5-dimethyl 2-(2-furyl)-4,5-dimethyl Cl Cl A B C 176b Me2Si 3-(2-thienyl)-2,5-dimethyl 3-(2-thienyl)-2,5-dimethyl Cl Cl A B C 177b Me2Si 2-(2-thienyl)-4,5-dimethyl 2-(2-thienyl)-4,5-dimethyl Cl Cl A B C 178b Me2Si 2-(5-methyl-2-furyl)-4,5- 2-(5-methyl-2-furyl)-4,5- Cl Cl A B C dimethyl dimethyl 179b Me2Si 2-(5-tert-butyl-2-furyl)-4,5- 2-(5-tert-butyl-2-furyl)-4,5- Cl Cl A B C dimethyl dimethyl 180b Me2Si 2-(5-trimethylsilyl-2-furyl)- 2-(5-trimethylsilyl-2-furyl)- Cl Cl A B C 4,5-dimethyl 4,5-dimethyl 181b Me2Si 2-(4,5-dimethyl-2-furyl)-4,5- 2-(4,5-dimethyl-2-furyl)-4,5- Cl Cl A B C dimethyl dimethyl 182b Me2Si 2-(2-benzofuryl)-4,5-dimethyl 2-(2-benzofuryl)-4,5-dimethyl Cl Cl A B C 183b Me2C 2-(2-furyl)-3-methyl 2-(2-furyl)-3-methyl Cl Cl A B C 184b Me2C 2-(2-furyl)-3,5-dimethyl 2-(2-furyl)-3,5-dimethyl Cl Cl B C 185b Me2C 2-(2-furyl)-4-ethyl-5-methyl 2-(2-furyl)-4-ethyl-5-methyl Cl Cl B C 186b Me2C 2-(2-furyl)-4-isopropyl-5- 2-(2-furyl)-4-isopropyl-5- Cl Cl B C methyl methyl 187b Me2C 2-(2-furyl)-4-tert-butyl-5- 2-(2-furyl)-4-tert-butyl-5- Cl Cl B C methyl methyl 188b Me2C 2-(2-furyl)-4-phenyl-5-methyl 2-(2-furyl)-4-phenyl-5-methyl Cl Cl B C

(ii) Examples include metallocene compounds classified into the bridged Ind₂Zr type; out of compounds recited in the above-described literatures such as JP-A-8-59724, JP-A-10-231314, JP-A-2003-105029 and JP-A-2004-352707, bridged bis(substituted or unsubstituted indenyl)zirconium compounds, bridged bis(substituted or unsubstituted azulenyl)zirconium compounds and bridged (substituted or unsubstituted indenyl)(substituted or unsubstituted azulenyl)zirconium compounds belonging to formula (6b) and formula (8b); and out of compounds recited in the above-described literatures such as JP-T-2002-535339 and JP-A-2004-352707, zirconium compounds having an indenyl or azulenyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group and belonging to formula (6b) and formula (8b).

Metallocene compounds classified into the bridged Ind₂Zr type are shown in Table b-11 and Table b-12.

TABLE 27 [Table b-11] (ii) Bridged Ind2Zr Type

No. A1 A2 A3 A4 189b Me2Si Ind Ind Cl A B 190b Me2Si Ind Ind Me A B 191b Me2Si Ind Ind Ph A B 192b Me2C Ind Ind Cl B 193b Me2Si H4Ind H4Ind Cl A B 194b PhMeSi H4Ind H4Ind Cl A B 195b Me2Si 2,4,4-Me3-H4Ind 2,4,4-Me3-H4Azu Cl A B C 196b Me2Si 2-Me-Ind 2-Me-Ind Cl A B C 197b Me2Si 2,4-Me2-Ind 2,4-Me2-Ind Cl A B C 198b Me2Si 2-Me-4-Ph-Ind 2-Me-4-Ph-Ind Cl A B C 199b Me2Si 2-Me-4,5-BenInd 2-Me-4,5-BenInd Cl A B C 200b Me2Si 2,4-Me2-H6Azu 2,4-Me2-H6Azu Cl A B C 201b Me2Si 2,4-Me2-H4Ind 2,4-Me2-H4Ind Cl A B C 202b Me2C 2-Me-4-(4-BiPh)-Azu 2-Me-4-(4-BiPh)-Azu Cl B C 203b Me2Si 2-Me-4-Ph-Ind 2,4-Ph2-Ind Cl A B C 204b Me2Si 2-Me-4-Ph-Ind 2-iPr-4-Ph Cl A B C 205b Me2Si 2-Me-4-(p-tBu-Ph)-Ind 2-iPr-4-(p-tBu-Ph)-Ind Cl A B C 206b Me2Si 2-(2-furyl)-indenyl 2-(2-furyl)-indenyl Cl A B C 207b Me2Ge 2-(2-furyl)-indenyl 2-(2-furyl)-indenyl Cl 208b Me2Si 2-(2-thienyl)-indenyl 2-(2-thienyl)-indenyl Cl A B C 209b H2C (2-(2-furyl)-indenyl (2-(2-furyl)-indenyl Cl B C 210b Me2C 2-(2-furyl)-indenyl 2-(2-furyl)-indenyl Cl B C 211b Me2Si 2-(2-furyl)-4,5,6,7- 2-(2-furyl)-4,5,6,7- Cl A B C tetrahydroindenyl tetrahydroindenyl 212b Me2C 2-(2-furyl)-7-methyl-indenyl 2-(2-furyl)-7-methyl-indenyl Cl B C 213b Me2C 2-(2-furyl)-4-methyl-indenyl 2-(2-furyl)-4-methyl-indenyl Cl B C 214h Me2C 2-(2-furyl)-3-methyl-indenyl 2-(2-furyl)-3-methyl-indenyl Cl B C 215b Me2C 2-(2-furyl)-3,7-dimethyl- 2-(2-furyl)-3,7-dimethyl- Cl B C indenyl indenyl 216b Me2C 2-(2-furyl)-4-chloro-indenyl 2-(2-furyl)-4-chloro-indenyl Cl B C 217b Me2C 2-(2-furyl)-4-phenyl-indenyl 2-(2-furyl)-4-phenyl-indenyl Cl A B C

TABLE b-12 (ii) Bridged Ind2Zr Type (continued) No. A1 A2 A3 A4 218b Me2C 2-(2-furyl)-4-methoxy-indenyl 2-(2-furyl)-4-methoxy-indenyl Cl B C 219b Me2C 2-(2-furyl)-4-phenoxy-indenyl 2-(2-furyl)-4-phenoxy-indenyl Cl B C 220b Me2C 2-(2-furyl)-4-trimethylsilyl- 2-(2-furyl)-4-trimethylsilyl- Cl B C indenyl indenyl 221b Me2Si 2-(2-furyl)-4-phenyl-indenyl 2-(2-furyl)-4-phenyl-indenyl Cl B C 222b Me2Si 2-(2-furyl)-4-phenyl-indenyl 2-(2-furyl)-4-phenyl-indenyl Me A B C 223b Me2Si 2-(2-thienyl)-4-phenyl-indenyl 2-(2-thienyl)-4-phenyl-indenyl Cl A B C 224b Me2Si 2-(3-furyl)-4-phenyl-indenyl 2-(3-furyl)-4-phenyl-indenyl Cl A B C 225b Me2Si 2-(3-methyl-2-furyl)-indenyl 2-(3-methyl-2-furyl)-indenyl Cl A B C 226b Me2Si 2-(3-methyl-2-furyl))-4-phenyl- 2-(3-methyl-2-furyl))-4-phenyl- Cl A B C indenyl indenyl 227b Me2Si 2-(2-furyl)-4-(4- 2-(2-furyl)-4-(4- Cl A B C isopropylphenyl)-indenyl isopropylphenyl)-indenyl 228b Me2Si 2-(2-furyl)-4,7-diphenyl- 2-(2-furyl)-4,7-diphenyl- Cl A B C indenyl indenyl 229b Me2Si 2-(2-furyl)-4-phenyl-7-methyl- 2-(2-furyl)-4-phenyl-7-methyl- Cl A B C indenyl indenyl 230b Me2Si 2-(2-furyl)-4-chloro-indenyl 2-(2-furyl)-4-chloro-indenyl Cl A B C 231b Me2Si 2-(2-furyl)-4-phenyl-indenyl 2-(2-furyl)-4-phenyl-indenyl Cl A B C 232b Me2Si 2-(2-furyl)-4-methoxy-indenyl 2-(2-furyl)-4-methoxy-indenyl Cl A B C 233b Me2Si 2,4-di(2-furyl)-indenyl 2,4-di(2-furyl)-indenyl Cl A B C 234b Me2Si 2-(2-furyl)-4-(2-thienyl)- 2-(2-furyl)-4-(2-thienyl)- Cl A B C indenyl indenyl 235b Me2Si 2-(2-furyl)-4-(2-benzofuryl)- 2-(2-furyl)-4-(2-benzofuryl)- Cl A B C indenyl indenyl 236b Me2Si 2-(2-furyl)-benzoindenyl 2-(2-furyl)-benzoindenyl Cl A B C 237b Me2Si 2-(2-furyl)-5,9-diethyl- 2-(2-furyl)-5,9-diethyl- Cl A B C benzindenyl benzindenyl 238b Me2Si 2-(2-furyl)-azulenyl 2-(2-furyl)-azulenyl Cl A B C 239b Me2Si 2-(4,5-dimethyl-2-furyl))- 2-(4,5-dimethyl-2-furyl))- Cl A B C azulenyl azulenyl 240b Me2Si 2-(5-trimethylsilyl-2-furyl))- 2-(5-trimethylsilyl-2-furyl))- Cl A B C azulenyl azulenyl 241b Me2Si 2-(2-furyl)-4-phenyl-azulenyl 2-(2-furyl)-4-phenyl-azulenyl Cl A B C 242b Me2Si 2-methyl-4-phenyl-indenyl 2-(2-(5-methyl)-furyl)-4- Cl A B C phenyl-indenyl 243b Me2Si 2-methyl-4-phenyl-indenyl 2-(2-(5-methyl)-furyl)-4- Cl A B C phenyl-indenyl 244b Me2Si 2-methyl-4-(1-naphthyl)indenyl 2-(2-(5-methylfuryl))-4-(1- Cl A B C naphthyl)indenyl 245b Me2Si 2-methyl-4-phenylindenyl 2-(2-(5-methylthienyl))-4- Cl A B C phenylindenyl

(iii) Examples include metallocene compounds classified into the bridged CpIndZr type; and out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-873 14, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (7b) and formula (9b).

Metallocene compounds classified into the bridged CpIndZr type are shown in Table b-13 to Table b-20.

TABLE 29 [Table b-13] (iii) Bridged CpIndZr Type

No. A1 A2 A3 A4 246b Me2C 4-methyl-cyclopentadienyl 3-methyl-indenyl Cl A B 247b Me2C 4-tert-butyl-cyclopentadienyl 3-methyl-indenyl Cl A B 248b Me2C 4-tert-butyl-cyclopentadienyl 3-tert-butyl-indenyl Cl A B 249b Me2Si 4-methyl-cyclopentadienyl 3-methyl-indenyl Cl A B 250b Me2Si 4-tert-butyl-cyclopentadienyl 3-methyl-indenyl Cl A B 251b Me2Si 4-tert-butyl-cyclopentadienyl 3-tert-butyl-indenyl Cl A B 252b Me2C 4-methyl-cyclopentadienyl 3-methyl-indenyl Me A B 253b Me2C 4-tert-butyl-cyclopentadienyl 3-methyl-indenyl Me A B 254b Me2C 4-tert-butyl-cyclopentadienyl 3-tert-butyl-indenyl Me A B 255b Me2C 3-tert-butylcyclopentadienyl 2-methylindenyl Cl A B C D 256b Me2Si 2-methyl-4-phenyl-1-indenyl 2,3,5-trimethyl-1- Cl A B C D cyclopentadienyl 257b Me2Si 2-methyl-benz[e]indenyl cyclopentadienyl Cl A B C D 258b Me2C 2-methylindenyl cyclopentadienyl Cl B C D 259b Me2Si 2-methyl-benz[e]indenyl 2-methylcyclopentadienyl Cl A B C D 260b Me2Si 2,3,4,5-tetramethyl- 2-methyl-4-phenyl-4H-1- Cl A B C D cyclopentadienyl azulenyl 261b Me2Si 2,3,4,5-tetramethyl- 2-methyl-4-phenyl-5,6,7,8- Cl A B C D cyclopentadienyl tetrahydro-4H-1-azulenyl 262b Me2Si 2,3,4,5-tetramethyl- 2,4-dimethyl-4H-1-azulenyl Cl A B C D cyclopentadienyl 263b Me2Si 2,3,4,5-tetramethyl- 2,4-dimethyl-5,6,7,8- Cl A B C D cyclopentadienyl tetrahydro-4H-1-azulenyl 264b Me2Si 2,3,4,5-tetramethyl- 2-ethyl-4-phenyl-4H-1-azulenyl Cl A B C D cyclopentadienyl 265b Me2Si 2,3,4,5-tetramethyl- 2-ethyl-4-methyl-4H-1-azulenyl Cl A B C D cyclopentadienyl 266b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl B C D E 267b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl A B C D E 268b Me2Si 3-ethylcyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl A B C D E 269b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl A B C D E 270b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl A B C D E 271b Me2Si 3-(trimethylsilyl)- 2-(5-methy1-2-furyl)indenyl Cl A B C D E cyclopentadienyl 272b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)indenyl Cl A B C D E

TABLE b-14 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 273b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl) 274b Me2Si 2-methyl-4-(2-naphthyl)- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 275b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 276b Me2Si 2-methyl-4-trimethyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E silylcyclopentadienyl 277b Me2Si 2-ethyl-4-i-propyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 278b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 279b Me2Si 2,5-dimethyl-3-tert-butyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 280b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)indenyl Cl A B C D E cyclopentadienyl 281b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 282b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 283b Me2Si 3-ethylcyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 284b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 285b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 286b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 287b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4- Cl A B C D E phenylindenyl 288b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 289b Me2Si 2-methyl-4-(2-naphthyl)- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 290b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 291b Me2Si 2-methyl-4-trimethylsilyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 292b Me2Si 2-ethyl-4-i-propyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 293b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 294b Me2Si 2,5-dimethyl-3-tert-butyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 295b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl

TABLE b-15 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 296b Me2Si cyclopentadienyl 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E phenylindenyl 297b Me2Si 3-methylcyclopentadienyl 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E phenylindenyl 298b Me2Si 3-phenylcyclopentadienyl 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E phenylindenyl 299b Me2Si 3-tert-butylcyclopentadienyl 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E phenylindenyl 300b Me2Si 3-(trimethylsilyl)- 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 301b Me2Si 2,4-dimethylcyclopentadienyl 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E phenylindenyl 302b Me2Si 2-methyl-4-phenyl- 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 303b Me2Si 2-methyl-4-tert-butyl- 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 304b Me2Si 2,3,5-trimethyl- 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 305b Me2Si 2,3,4,5-tetramethyl- 2-(4,5-dimethyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 306b Me2Si cyclopentadienyl 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E phenylindenyl 307b Me2Si 3-methylcyclopentadienyl 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E phenylindenyl 308b Me2Si 3-phenylcyclopentadienyl 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E phenylindenyl 309b Me2Si 3-tert-butylcyclopentadienyl 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E phenylindenyl 310b Me2Si 3-(trimethylsilyl)- 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 311b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E phenylindenyl 312b Me2Si 2-methyl-4-phenyl- 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 313b Me2Si 2-methyl-4-tert-butyl- 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 314b Me2Si 2,3,5-trimethyl- 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 315b Me2Si 2,3,4,5-tetramethyl- 2-(5-tert-butyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl

TABLE b-16 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 316b Me2Si cyclopentadienyl 2-(5-phenyl-2-furyl)-4- Cl A B C D E phenylindenyl 317b Me2Si 3-methylcyclopentadienyl 2-(5-phenyl-2-furyl)-4- Cl A B C D E phenylindenyl 318b Me2Si 3-phenylcyclopentadienyl 2-(5-phenyl-2-furyl)-4- Cl A B C D E phenylindenyl 319b Me2Si 3-tert-butylcyclopentadienyl 2-(5-phenyl-2-furyl)-4- Cl A B C D E phenylindenyl 320b Me2Si 3-(trimethylsilyl)- 2-(5-phenyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 321b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-phenyl-2-furyl)-4- Cl A B C D E phenylindenyl 322b Me2Si 2-methyl-4-phenyl- 2-(5-phenyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 323b Me2Si 2-methyl-4-tert-butyl- 2-(5-phenyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 324b Me2Si 2,3,5-trimethyl- 2-(5-phenyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 325b Me2Si 2,3,4,5-tetramethyl- 2-(5-phenyl-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 326b Me2Si cyclopentadienyl 2-(4,5-benzo-2-furyl)-4- Cl A B C D E phenylindenyl 327b Me2Si 3-methylcyclopentadienyl 2-(4,5-benzo-2-furyl)-4- Cl A B C D E phenylindenyl 328b Me2Si 3-phenylcyclopentadienyl 2-(4,5-benzo-2-furyl)-4- Cl A B C D E phenylindenyl 329b Me2Si 3-tert-butylcyclopentadienyl 2-(4,5-benzo-2-furyl)-4- Cl A B C D E phenylindenyl 330b Me2Si 3-(trimethylsilyl)- 2-(4,5-benzo-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 331b Me2Si 2,4-dimethylcyclopentadienyl 2-(4,5-benzo-2-furyl)-4- Cl A B C D E phenylindenyl 332b Me2Si 2-methyl-4-phenyl- 2-(4,5-benzo-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 333b Me2Si 2-methyl-4-tert-butyl- 2-(4,5-benzo-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 334b Me2Si 2,3,5-trimethyl- 2-(4,5-benzo-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl 335b Me2Si 2,3,4,5-tetramethyl- 2-(4,5-benzo-2-furyl)-4- Cl A B C D E cyclopentadienyl phenylindenyl

TABLE b-17 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 336b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E tert-butylphenyl)indenyl 337b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E tert-butylphenyl)indenyl 338b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E tert-butylphenyl)indenyl 339b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E tert-butylphenyl)indenyl 340b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl tert-butylphenyl)indenyl 341b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E tert-butylphenyl)indenyl 342b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl tert-butylphenyl)indenyl 343b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl tert-butylphenyl)indenyl 344b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl tert-butylphenyl)indenyl 345b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl tert-butylphenyl)indenyl 346b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E propylphenyl)indenyl 347b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E propylphenyl)indenyl 348b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E propylphenyl)indenyl 349b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E propylphenyl)indenyl 350b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E cyclopentadienyl propylphenyl)indenyl 351b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E propylphenyl)indenyl 352b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E cyclopentadienyl propylphenyl)indenyl 353b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E cyclopentadienyl propylphenyl)indenyl 354b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E cyclopentadienyl propylphenyl)indenyl 355b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4-(4-i- Cl A B C D E cyclopentadienyl propylphenyl)indenyl

TABLE b-18 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 356b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E chlorophenyl)indenyl 357b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E chlorophenyl)indenyl 358b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E chlorophenyl)indenyl 359b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E chlorophenyl)indenyl 360b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl chlorophenyl)indenyl 361b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E chlorophenyl)indenyl 362b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl chlorophenyl)indenyl 363b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl chlorophenyl)indenyl 364b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl chlorophenyl)indenyl 365b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4-(4- Cl A B C D E cyclopentadienyl chlorophenyl)indenyl 366b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E di-tert-butylphenyl)indenyl 367b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E di-tert-butylphenyl)indenyl 368b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E di-tert-butylphenyl)indenyl 369b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E di-tert-butylphenyl)indenyl 370b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E cyclopentadienyl di-tert-butylphenyl)indenyl 371b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E di-tert-butylphenyl)indenyl 372b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4-3,5- Cl A B C D E cyclopentadienyl di-tert-butylphenyl)indenyl 373b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E cyclopentadienyl di-tert-butylphenyl)indenyl 374b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E cyclopentadienyl di-tert-butylphenyl)indenyl 375b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4-(3,5- Cl A B C D E cyclopentadienyl di-tert-butylphenyl)indenyl

TABLE b-19 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 376b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E methylphenyl)indenyl 377b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E methylphenyl)indenyl 378b Me2Si 3-phenylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E methylphenyl)indenyl 379b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E methylphenyl)indenyl 380b Me2Si 3-(trimethylsilyl)- 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E cyclopentadienyl methylphenyl)indenyl 381b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E methylphenyl)indenyl 382b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E cyclopentadienyl methylphenyl)indenyl 383b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E cyclopentadienyl methylphenyl)indenyl 384b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E cyclopentadienyl methylphenyl)indenyl 385b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-4-(2- Cl A B C D E cyclopentadienyl methylphenyl)indenyl 386b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E 4-phenylindenyl 387b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E 4-phenylindenyl 388b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E 4-phenylindenyl 389b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E 4-phenylindenyl 390b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E cyclopentadienyl 4-phenylindenyl 391b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E cyclopentadienyl 4-phenylindenyl 392b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E cyclopentadienyl 4-phenylindenyl 393b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-3-methyl- Cl A B C D E cyclopentadienyl 4-phenylindenyl 394b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-3-n- Cl A B C D E butyl-4-phenylindenyl 395b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-3-n- Cl A B C D E butyl-4-phenylindenyl

TABLE b-20 (iii) Bridged CpIndZr Type (continued) No. A1 A2 A3 A4 396b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-3-n- Cl A B C D E butyl-4-phenylindenyl 397b Me2Si 2,4-dimethylcyclopentadienyl (2-(5-methyl-2-furyl)-3-n- Cl A B C D E butyl-4-phenylindenyl 398b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-3-n- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 399b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-3-n- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 400b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-3-n- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 401b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-3-n- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 402b Me2Si cyclopentadienyl 2-(5-methyl-2-furyl)-3-s- Cl A B C D E butyl-4-phenylindenyl 403b Me2Si 3-methylcyclopentadienyl 2-(5-methyl-2-furyl)-3-s- Cl A B C D E butyl-4-phenylindenyl 404b Me2Si 3-tert-butylcyclopentadienyl 2-(5-methyl-2-furyl)-3-s- Cl A B C D E butyl-4-phenylindenyl 405b Me2Si 2,4-dimethylcyclopentadienyl 2-(5-methyl-2-furyl)-3-s- Cl A B C D E butyl-4-phenylindenyl 406b Me2Si 2-methyl-4-phenyl- 2-(5-methyl-2-furyl)-3-s- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 407b Me2Si 2-methyl-4-tert-butyl- 2-(5-methyl-2-furyl)-3-s- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 408b Me2Si 2,3,5-trimethyl- 2-(5-methyl-2-furyl)-3-s- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl 409b Me2Si 2,3,4,5-tetramethyl- 2-(5-methyl-2-furyl)-3-s- Cl A B C D E cyclopentadienyl butyl-4-phenylindenyl

The metallocene compound also includes, for example, compounds where zirconium in the compounds above is replaced by titanium or hafnium. In the case of using these metallocene compounds as the component (A-2b), two or more thereof may be also used.

In specific compounds exemplified above, preferred metallocene compounds as the component (A-2b) in view of polymerization activity are denoted by “A”. Examples of the compound preferred in view of high polymerization activity include: 1-indenyl-2-indenyl-dimethylsilylzirconium dichloride; out of compounds recited in the above-described literatures such as JP-A-2-76887, JP-A-3-12406, JP-A-3-12407, JP-A-3-12407, JP-A-11-315089, JP-A-2009-143901 and JP-T-2005-507961, silicon-bridged bis(alkyl-substituted cyclopentadienyl)zirconium compounds belong to formula (2b), where the total number of alkyl substituents on two cyclopentadienyl rings is 4 or more; out of zirconium compounds having a cyclopentadienyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group described in JP-T-2002-535339 and the like and belonging to formula (2b), compounds having a silicon-bridged bis(substituted cyclopentadienyl) structure, where the total number of substituents on two cyclopentadienyl rings, including the oxygen-containing hydrocarbon group or the like, is 4 or more; out of compounds recited in the above-described literatures such as JP-A-8-59724, JP-A-10-231314, JP-A-2003-105029 and JP-A-2004-352707, silicon-bridged bis(substituted or unsubstituted indenyl)zirconium compounds, silicon-bridged bis(substituted or unsubstituted azulenyl)zirconium compounds and silicon-bridged (substituted or unsubstituted indenyl)(substituted or unsubstituted azulenyl)zirconium compounds belonging to formula (6b) and formula (8b); out of compounds recited in the above-described literatures such as JP-T-2002-535339 and JP-A-2004-352707, silicon-bridged bis(substituted or unsubstituted indenyl)zirconium compounds, silicon-bridged bis(substituted or unsubstituted azulenyl)zirconium compounds and silicon-bridged (substituted or unsubstituted indenyl)(substituted or unsubstituted azulenyl)zirconium compounds, each having an indenyl or azulenyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group and belonging to formula (6b) and formula (8b); and out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-87314, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (7b) and formula (9b), where the total number of substituents which may be the above-described oxygen-containing hydrocarbon group or the like, on cyclopentadienyl rings connected by a bridging group and on a cyclopentadienyl ring having a co-ring is 2 or more.

Similarly, in specific compounds exemplified above, preferred metallocene compounds as the component (A-2b) in view of excellent moldability are denoted by “B”. Examples of the compound preferred in view of excellent moldability include: 1-indenyl-2-indenyl-dimethylsilylzirconium dichloride; out of compounds recited in the above-described literatures such as JP-A-2-76887, JP-A-3-12406, JP-A-3-12407, JP-A-3-12407, JP-A-11-315089, JP-A-2009-143901 and JP-T-2005-507961, zirconium compounds having a bridged bis(alkyl-substituted cyclopentadienyl) structure and belonging to formula (2b), where the 2-position of at least one cyclopentadienyl ring is substituted with an alkyl group and an arbitrary position of at least another cyclopentadienyl ring is substituted with an alkyl group; out of zirconium compounds having a cyclopentadienyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group described in JP-T-2002-535339 and the like and belonging to formula (2b), such as dimethylsilylenebis(2-(2-furyl)-3,5-dimethylcyclopentadienyl)zirconium dichloride, zirconium compounds having a bridged bis(substituted cyclopentadienyl) structure, where the 2-position of at least one cyclopentadienyl ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group and an arbitrary position of at least another cyclopentadienyl ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group: out of compounds recited in the above-described literatures such as JP-A-8-59724, JP-A-10-231314, JP-A-2003-105029 and JP-A-2004-352707, silicon-bridged or carbon-bridged bis(substituted or unsubstituted indenyl)zirconium compounds, silicon-bridged or carbon-bridged bis(substituted or unsubstituted azulenyl)zirconium compounds and silicon-bridged or carbon-bridged (substituted or unsubstituted indenyl)(substituted or unsubstituted azulenyl)zirconium compounds belonging to formula (6b) and formula (8b); out of compounds recited in the above-described literatures such as JP-T-2002-535339 and JP-A-2004-352707, zirconium compounds having an indenyl or azulenyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group and belonging to formula (6b) and formula (8b), where the rings are bridged by a silicon bridging group or a carbon bridging group; and out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-87314, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (7b) and formula (9b), where at least one or more substituents which may be the above-described oxygen-containing hydrocarbon group or the like are substituted on cyclopentadienyl rings connected by a bridging group and on a cyclopentadienyl ring having a co-ring or the 2-position of at least the cyclopentadienyl ring having a co-ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group.

Also, in specific compounds exemplified above, more preferred compounds in view of excellent moldability are denoted by “C”, and other examples include: out of compounds recited in the above-described literatures such as JP-A-2-76887, JP-A-3-12406, JP-A-3-12407, JP-A-3-12407, JP-A-11-315089, JP-A-2009-143901 and JP-T-2005-507961, zirconium compounds having a bridged bis(alkyl-substituted cyclopentadienyl) structure and belonging to formula (2b), where the 2-position of at least one cyclopentadienyl ring is substituted with an alkyl group and the 2- or 5-position of at least another cyclopentadienyl ring is substituted with an alkyl group: out of zirconium compounds having a cyclopentadienyl ring substituted, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group described in JP-T-2002-535339 and the like and belonging to formula (2b), such as dimethylsilylenebis(2-(2-furyl)-3,5-dimethylcyclopentadienyl)zirconium dichloride, zirconium compounds having a bridged bis(substituted cyclopentadienyl) structure, where the 2-position of at least one cyclopentadienyl ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group and the 2- or 5-position of at least another cyclopentadienyl ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group; out of compounds recited in the above-described literatures such as JP-A-8-59724, JP-A-10-231314, JP-A-2003-105029 and JP-A-2004-352707, silicon-bridged or carbon-bridged bis(substituted or unsubstituted indenyl)zirconium compounds, silicon-bridged or carbon-bridged bis(substituted or unsubstituted azulenyl)zirconium compounds and silicon-bridged or carbon-bridged (substituted or unsubstituted indenyl)(substituted or unsubstituted azulenyl)zirconium compounds belonging to formula (6b) and formula (8b), where the 2-position of at least one indenyl or azulenyl ring is substituted with an alkyl group; out of compounds recited in the above-described literatures such as JP-T-2002-535339 and JP-A-2004-352707, zirconium compounds having an indenyl or azulenyl ring substituted on the 2-position, for example, with an oxygen-containing hydrocarbon group, a sulfur-containing hydrocarbon group or a hydrocarbon group-substituted silyl group and belonging to formula (6b) and formula (8b), where the rings are bridged by a silicon bridging group or a carbon bridging group; and out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-87314, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (7b) and formula (9b), where the 2-position of at least a cyclopentadienyl ring having a co-ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group.

Furthermore, in specific compounds exemplified above, still more preferred compounds in view of excellent moldability are denoted by “D”, and other examples include: out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-87314, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (7b) and formula (9b), where the 2-position of at least the cyclopentadienyl ring having a co-ring is substituted with the above-described oxygen-containing hydrocarbon group or the like or with an alkyl group.

In addition, in specific compounds exemplified above, yet still more preferred compounds in view of excellent moldability are denoted by “E”, and other examples include: out of compounds recited in the above-described literatures such as JP-A-6-87922, JP-A-8-92308, JP-A-9-87314, JP-A-7-224079 and JP-A-2005-336092, zirconium compounds belonging to formula (76) and formula (9b), where the 2-position of at least the cyclopentadienyl ring having a co-ring is substituted with the above-described oxygen-containing hydrocarbon group or the like.

Synthesis examples of the metallocene compound as the component (A-2b) according to the present invention are described below, but the present invention is not limited to these synthesis methods in particular.

For example, there are a method where an indene compound is lithiated, then reacted with a dichlorosilane compound and subsequently reacted with cyclopentadienyl lithium to obtain a ligand and the obtained ligand is reacted with a tetrakis(alkylamido)zirconium and then with trimethylsilyl chloride, and a method where the obtained ligand is lithiated and subsequently reacted with zirconium tetrachloride.

IV-2. Olefin Polymerization Catalyst Component Containing Component (Ac) of the Present Invention

A second embodiment of the olefin polymerization catalyst component of the present invention contains the component (Ac) defined below as an essential component.

Component (Ac): a metallocene compound represented by the following formula (1c), where a cyclopentadienyl ring and an indenyl ring are bridged and a specific substituent is substituted on the 4-position of the indenyl ring:

[in formula (1c), M^(1c) represents any one transition metal of Ti, Zr and Hf; each of X^(1c) and X^(2c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1c) and Q^(2c) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1c) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1c) may combine to form a ring together with Q^(1c) and Q^(2c); m^(c) is 0 or 1 and when m^(c) is 0, Q^(1c) is bonded directly to the conjugated 5-membered ring including R^(2c); each of R^(2c) and R^(4c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and R^(3c) represents a substituted aryl group represented by the following formula (1-ac)]:

[in formula (1-ac), Y^(1c) represents an atom of Group 14, Group 15 or Group 16 of the periodic table; each of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) independently represents a hydrogen atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing oxygen or nitrogen and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; adjacent groups of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) may combine with each other to form a ring together with the atoms bonded to these groups; n^(c) is 0 or 1 and when n^(c) is 0, the substituent R^(5c) is not present on Y^(1c); and p^(c) is 0 or 1 and when p^(c) is 0, the carbon atom to which R^(7c) is bonded and the carbon atom to which R^(9c) is bonded are bonded directly; provided that when Y^(1c) is a carbon atom, at least one of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) is not a hydrogen atom].

In formula (1c), M^(1c) of the metallocene compound represents Ti, Zr or Hf; M^(1c) of the metallocene compound preferably represents Zr or Hf; and M^(1c) of the metallocene compound more preferably represents Zr.

Each of X^(1c) and X^(2c) independently includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an i-propoxymethyl group, an n-butoxymethyl group, an i-butoxymethyl group, a tert-butoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an acetyl group, a 1-oxopropyl group, a 1-oxo-n-butyl group, a 2-methyl-1-oxopropyl group, a 2,2-dimethyl-1-oxo-propyl group, a phenylacetyl group, a diphenylacetyl group, a benzoyl group, a 2-methoxyphenyl group, a 3-methoxyphenyl group, a 4-methoxyphenyl group, a 2-furyl group, a 2-tetrahydrofuryl group, a dimethylaminomethyl group, a diethylaminomethyl group, a di-i-propylaminomethyl group, a bis(dimethylamino)methyl group, a bis(di-i-propylamino)methyl group, a (dimethylamino)(phenyl)methyl group, a methylimino group, an ethylimino group, a 1-(methylimino)ethyl group, a 1-(phenylimino)ethyl group, a 1-[(phenylmethyl)imino]ethyl group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, a phenoxy group, a dimethylamino group, a diethylamino group, a di-n-propylamino group, a di-i-propylamino group, a di-n-butylamino group, a di-i-butylamino group, a di-tert-butylamino group, and a diphenylamino group.

Specific preferred examples of X^(1c) and X^(2c) include a chlorine atom, a bromine atom, a methyl group, an n-butyl group, an i-butyl group, a methoxy group, an ethoxy group, an i-propoxy group, an n-butoxy group, a phenoxy group, a dimethylamino group, and a di-i-propylamino group. Among these specific examples, a chlorine atom, a methyl group, and a dimethylamino group are more preferred.

Each of Q^(1c) and Q^(2c) independently represents a carbon atom, a silicon atom or a germanium atom and is preferably a carbon atom or a silicon atom, more preferably a silicon atom.

Each R^(1c) independently includes, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, and a phenyl group. In the case where R^(1c) forms a ring together with Q^(1c) and Q^(2c), examples include a cyclobutylidene group, a cyclopentylidene group, a cyclohexylidene group, a silacyclobutyl group, a silacyclopentyl group, and a silacyclohexyl group.

When Q^(1c) or/and Q^(2c) are a carbon atom, specific preferred examples of RIe include a hydrogen atom, a methyl group, an ethyl group, a phenyl group and a cyclobutylidene group, and when Q^(1c) or/and Q^(2c) are a silicon atom, specific preferred examples include a methyl group, an ethyl group, a phenyl group and a silacyclobutyl group.

Each of R^(2c) and R^(4c) includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

Each of R^(2c) and R^(4c) is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, because the polymerization activity becomes high in particular.

Specific preferred examples of R^(2c) and R^(4c) include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a 2-methylfuryl group, and a trimethylsilyl group. Among these specific examples, a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are more preferred, and a hydrogen atom, a methyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are still more preferred.

The substituent R^(13c) represents a substituted aryl group having a structure represented by formula (1-ac), preferably a Ph group having a specific substituent, furyl groups, or thienyl groups. Specific examples include a 4-trimethylsilylphenyl group, a 4-(tert-butyldimethylsilyl)phenyl group, a 4-(3,5-bistrimethylsilyl)phenyl group, a 4-chlorophenyl group, a 4-bromophenyl group, a 3,5-dichlorophenyl group, a 2,4,6-trichlorophenyl group, a 4-methoxyphenyl group, a 4-ethoxyphenyl group, a 4-isopropoxyphenyl group, a 4-n-butoxyphenyl group, a 2-furyl group, a 2-(5-methyl)furyl group, a 2-(5-tert-butyl)furyl group, a 2-(5-trimethylsilyl)furyl group, a 2-(2,3-dimethyl)furyl group, a 2-benzofuryl group, a 2-thienyl group, a 2-(5-methyl)thienyl group, a 2-(5-tert-butyl)thienyl group, a 2-(5-trimethylsilyl)thienyl group, and a 2-(2,3-dimethyl)thienyl group.

Also, in formula (1), m^(c) is 0 or 1 and when m^(c) is 0, Q^(1c) is bonded directly to the conjugated 5-membered ring including R^(2c).

The metallocene compound of the present invention is preferably a compound represented by the following formula (2c):

In the metallocene compound represented by formula (2c), for M^(1c), X^(1c), X^(2c), Q^(1c), R^(1c), R^(2c) and R^(4c), the same structures as the atom and the group described above in the metallocene compound represented by formula (1c) may be selected. Also, for R^(10c), the same structure as the atom or group of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) described above in the metallocene compound represented by formula (1c) may be selected.

As the metallocene compound of the present invention, a compound represented by the following formula (3c) is also preferred similarly to formula (2c):

In the metallocene compound represented by formula (3c), for M^(1c), X^(1c), X^(2c), Q^(1c), R^(1c), R^(2c) and R^(4c), the same structures as the atom and the group described above in the metallocene compound represented by formula (1c) may be selected. Also, for R^(12c), R^(13x) and R^(14c), the same structures as the atom and the group of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) described above in the metallocene compound represented by formula (1c) may be selected. Z1c represents an oxygen atom or a sulfur atom.

Specific examples of the metallocene compound represented by formula (3c) are shown in Tables c-1 to c-5 by using formula (4c), but the present invention is not limited thereto.

TABLE c-1 R^(3c) = Si-Substituted Phenyl Group X^(1c), No. M^(1c) X^(2c) Q^(1c) R^(3c)  1c Zr Cl Me₂Si 4-(trimethylsilyl)-phenyl  2c Zr Br Me₂Si 4-(trimethylsilyl)-phenyl  3c Zr Me Me₂Si 4-(trimethylsilyl)-phenyl  4c Zr Ph Me₂Si 4-(trimethylsilyl)-phenyl  5c Zr Cl Et₂Si 4-(trimethylsilyl)-phenyl  6c Zr Cl Ph₂Si 4-(trimethylsilyl)-phenyl  7c Zr Cl silacyclobutyl 4-(trimethylsilyl)-phenyl  8c Zr Cl silacyclohexyl 4-(trimethylsilyl)-phenyl  9c Zr Cl Me₂C 4-(trimethylsilyl)-phenyl 10c Zr Cl Ph₂C 4-(trimethylsilyl)-phenyl 11c Zr Cl Me₂Ge 4-(trimethylsilyl)-phenyl 12c Zr Cl Me₂Si 4-(triethylsilyl)-phenyl 13c Zr Cl Me₂Si 4-(tri-n-propylsilyl)-phenyl 14c Zr Cl Me₂Si 4-(tri-i-propylsilyl)-phenyl 15c Zr Cl Me₂Si 4-(tri-n-butylsilyl)-phenyl 16c Zr Cl Me₂Si 4-(tri-i-butylsilyl)-phenyl 17c Zr Cl Me₂Si 4-(tri-n-pentylsilyl)-phenyl 18c Zr Cl Me₂Si 4-(tri-n-hexylsilyl)-phenyl 19c Zr Cl Me₂Si 4-(trivinylsilyl)-phenyl 20c Zr Cl Me₂Si 4-(triphenylsilyl)-phenyl 21c Zr Cl Me₂Si 4-(tribenzylsilyl)-phenyl 22c Zr Cl Me₂Si 4-(t-butyldimethylsilyl)-phenyl 23c Zr Cl Me₂Si 4-(di-tert-butylmethylsilyl)- phenyl 24c Zr Cl Me₂Si 4-(dimethylethylsilyl)-phenyl 25c Zr Cl Me₂Si 4-(methyldiethylsilyl)-phenyl 26c Zr Cl Me₂Si 4-(dimethyl-n-propylsilyl)-phenyl 27c Zr Cl Me₂Si 4-(methyl-di-n-propylsilyl)-phenyl 28c Zr Cl Me₂Si 4-(dimethyl-i-propylsilyl)-phenyl 29c Zr Cl Me₂Si 4-(methyl-di-i-propylsilyl)-phenyl 30c Zr Cl Me₂Si 4-(dimethyl-n-butylsilyl)-phenyl

TABLE c-2 R^(3c) = Si-Substituted Phenyl Group (continued) X^(1c), No. M^(1c) X^(2c) Q^(1c) R^(3c) 31c Zr Cl Me₂Si 4-(methyl-di-n-butylsilyl)-phenyl 32c Zr Cl Me₂Si 4-(dimethyl-n-pentylsilyl)-phenyl 33c Zr Cl Me₂Si 4-(methyl-di-n-pentylsilyl)-phenyl 34c Zr Cl Me₂Si 4-(dimethylbenzylsilyl)-phenyl 35c Zr Cl Me₂Si 4-(methyldibenzylsilyl)-phenyl 36c Zr Cl Me₂Si 4-(dimethylvinylsilyl)-phenyl 37c Zr Cl Me₂Si 4-(methyldivinylsilyl)-phenyl 38c Zr Cl Me₂Si 4-(dimethylmethoxysilyl)-phenyl 39c Zr Cl Me₂Si 4-(methyldimethoxysilyl)-phenyl 40c Zr Cl Me₂Si 4-(trimethoxysilyl)-phenyl 41c Zr Cl Me₂Si 4-(ethoxydimethylsilyl)-phenyl 42c Zr Cl Me₂Si 4-(diethoxymethylsilyl)-phenyl 43c Zr Cl Me₂Si 4-(triethoxysilyl)-phenyl 44c Zr Cl Me₂Si 4-(dimethylphenylsilyl)-phenyl 45c Zr Cl Me₂Si 4-(methyldiphenylsilyl)-phenyl 46c Zr Cl Me₂Si 4-(diethylphenylsilyl)-phenyl 47c Zr Cl Me₂Si 4-(ethyldiphenylsilyl)-phenyl 48c Zr Cl Me₂Si 4-(methoxydiphenylsilyl)-phenyl 49c Zr Cl Me₂Si 4-(dimethoxyphenylsilyl)-phenyl 50c Zr Cl Me₂Si 4-(ethoxydiphenylsilyl)-phenyl 51c Zr Cl Me₂Si 4-(diethoxyphenylsilyl)-phenyl 52c Zr Cl Me₂Si 4-(allyldimethylsilyl)-phenyl 53c Zr Cl Me₂Si 4-(diallylmethylsilyl)-phenyl 54c Zr Cl Me₂Si 4-(triallylsilyl)-phenyl

TABLE c-3 R^(3c) = Furyl or Thienyl Substituent No. M^(1c) X^(1c), X^(2c) Q^(1c) R^(3c) 55c Zr Cl Me₂Si 2-furyl 56c Zr Cl Me₂Si 5-methyl-2-furyl 57c Zr Br Me₂Si 5-methyl-2-furyl 58c Zr Me Me₂Si 5-methyl-2-furyl 59c Zr Ph Me₂Si 5-methyl-2-furyl 60c Zr Cl Et₂Si 5-methyl-2-furyl 61c Zr Cl Ph₂Si 5-methyl-2-furyl 62c Zr Cl silacyclobutyl 5-methyl-2-furyl 63c Zr Cl silacyclohexyl 5-methyl-2-furyl 64c Zr Cl Me₂C 5-methyl-2-furyl 65c Zr Cl Ph₂C 5-methyl-2-furyl 66c Zr Cl Me₂Ge 5-methyl-2-furyl 67c Zr Cl Me₂Si 5-ethyl-2-furyl 68c Zr Cl Me₂Si 5-n-propyl-2-furyl 69c Zr Cl Me₂Si 5-i-propyl-2-furyl 70c Zr Cl Me₂Si 5-n-butyl-2-furyl 71c Zr Cl Me₂Si 5-i-butyl-2-furyl 72c Zr Cl Me₂Si 5-tert-butyl-2-furyl 73c Zr Cl Me₂Si 5-trimethylsilyl-2-furyl 74c Zr Cl Me₂Si 5-triethylsilyl-2-furyl 75c Zr Cl Me₂Si 5-phenyl-2-furyl 76c Zr Cl Me₂Si 5-tolyl-2-furyl 77c Zr Cl Me₂Si 5-fluorophenyl-2-furyl 78c Zr Cl Me₂Si 5-chlorophenyl-2-furyl 79c Zr Cl Me₂Si 4,5-dimethyl-2-furyl 80c Zr Cl Me₂Si 2-benzofuryl 81c Zr Cl Me₂Si 2-thienyl 82c Zr Cl Me₂Si 5-methyl-2-thienyl 83c Zr Cl Me₂Si 5-ethyl-2-thienyl 84c Zr Cl Me₂Si 5-n-propyl-2-thienyl 85c Zr Cl Me₂Si 5-i-propyl-2-thienyl 86c Zr Cl Me₂Si 5-tert-butyl-2-thienyl 87c Zr Cl Me₂Si 5-trimethylsilyl-2-thienyl 88c Zr Cl Me₂Si 5-triethylsilyl-2-thienyl 89c Zr Cl Me₂Si 5-phenyl-2-thienyl 90c Zr Cl Me₂Si 5-tolyl-2-thienyl 91c Zr Cl Me₂Si 5-fluorophenyl-2-thienyl 92c Zr Cl Me₂Si 5-chlorophenyl-2-thienyl 93c Zr Cl Me₂Si 4,5-dimethyl-2-thienyl 94c Zr Cl Me₂Si 2-benzothienyl

TABLE c-4 R^(3c) = Halogen-Substituted Phenyl Group No. M^(1c) X^(1c), X^(2c) Q^(1c) R^(3c)  95c Zr Cl Me₂Si 4-chloro-phenyl  96c Zr Br Me₂Si 4-chloro-phenyl  97c Zr Me Me₂Si 4-chloro-phenyl  98c Zr Ph Me₂Si 4-chloro-phenyl  99c Zr Cl Et₂Si 4-chloro-phenyl 100c Zr Cl Ph₂Si 4-chloro-phenyl 101c Zr Cl silacyclobutyl 4-chloro-phenyl 102c Zr Cl silacyclohexyl 4-chloro-phenyl 103c Zr Cl Me₂C 4-chloro-phenyl 104c Zr Cl Ph₂C 4-chloro-phenyl 105c Zr Cl Me₂Ge 4-chloro-phenyl 106c Zr Cl Me₂Si 4-bromo-phenyl 107c Zr Cl Me₂Si 4-iodo-phenyl 108c Zr Cl Me₂Si 3,5-dichloro-phenyl 109c Zr Cl Me₂Si 3,5-dibromo-phenyl 110c Zr Cl Me₂Si 2,6-dichloro-phenyl 111c Zr Cl Me₂Si 2,6-dibromo-phenyl 112c Zr Cl Me₂Si 2,4,6-trichloro-phenyl 113c Zr Cl Me₂Si 2,4,6-tribromo-phenyl 114c Zr Cl Me₂Si 2,3,4,5,6-pentachloro-phenyl 115c Zr Cl Me₂Si 2,3,4,5,6-pentabromo-phenyl

TABLE c-5 R^(3c) = Alkoxy-Substituted Phenyl Group X^(1c), No. M^(1c) X^(2c) Q^(1c) R^(3c) 116c Zr Cl Me₂Si 4-methoxy-phenyl 117c Zr Br Me₂Si 4-methoxy-phenyl 118c Zr Me Me₂Si 4-methoxy-phenyl 119c Zr Ph Me₂Si 4-methoxy-phenyl 120c Zr Cl Et₂Si 4-methoxy-phenyl 121c Zr Cl Ph₂Si 4-methoxy-phenyl 122c Zr Cl silacyclobutyl 4-methoxy-phenyl 123c Zr Cl silacyclohexyl 4-methoxy-phenyl 124c Zr Cl Me₂C 4-methoxy-phenyl 125c Zr Cl Ph₂C 4-methoxy-phenyl 126c Zr Cl Me₂Ge 4-methoxy-phenyl 127c Zr Cl Me₂Si 4-ethoxy-phenyl 128c Zr Cl Me₂Si 4-n-propoxy-phenyl 129c Zr Cl Me₂Si 4-i-propoxy-phenyl 130c Zr Cl Me₂Si 4-n-butoxy-phenyl 131c Zr Cl Me₂Si 4-i-butoxy-phenyl 132c Zr Cl Me₂Si 4-tert-butoxy-phenyl 133c Zr Cl Me₂Si 4-phenoxy-phenyl 134c Zr Cl Me₂Si 4-(2,4,6-trimethylphenoxy)-phenyl 135c Zr Cl Me₂Si 4-(2,6-di-i-propylphenoxy)-phenyl 136c Zr Cl Me₂Si 4-(2,6-di-tert-butylphenoxy)- phenyl 137c Zr Cl Me₂Si 3,5-dimethoxy-phenyl 138c Zr Cl Me₂Si 2,4,6-trimethoxy-phenyl 139c Zr Cl Me₂Si 4-thiomethoxy-phenyl 140c Zr Cl Me₂Si 4-dimethylamino-phenyl 141c Zr Cl Me₂Si 4-diethylamino-phenyl 142c Zr Cl Me₂Si 4-trimethylsilyloxy-phenyl 143c Zr Cl Me₂Si 4-triethylsilyloxy-phenyl

For example, compounds where zirconium of the compounds above is replaced by titanium or hafnium are also preferred.

Among specific compounds exemplified above, preferred metallocene compounds as the essential component (Ac) are described below. The compounds include, for example, 1c-10c, 12c to 65c, 67c to 80c, and 95c to 143c in Tables c-1 to c-5.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Among specific compounds exemplified above, more preferred metallocene compounds as the essential component (Ac) are described below. The compounds include, for example, 1c-4c, 7c, 8c, 12c to 38c, 44c to 47c, 52c to 59c, 62c, 63c, 67c to 80c, 116c to 123c, 127c to 136c, 142c, and 143c in Tables c-1 to c-5.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Furthermore, among specific compounds exemplified above, in terms of high polymerization activity, still more preferred metallocene compounds as the essential component (Ac) are described below. The compounds include, for example, 1c-8c, 12c to 38c, 44c to 47c, 52c to 63c, 67c to 80c, 116c to 123c, 127c to 136c, 142c, and 143c in Tables c-1 to c-5.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

In addition, among specific compounds exemplified above, in terms of excellent moldability, still more preferred metallocene compounds as the essential component (Ac) are described below. The compounds include, for example, 1c-4c, 7c to 10c, 12c to 59c, 62c to 65c, 67c to 80c, and 95c to 143c in Tables c-1 to c-5.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

In the case of using these metallocene compounds as the component (Ac), two or more thereof may be also used.

Synthesis Method of Metallocene Compound

The metallocene compound of the present invention can be synthesized by an arbitrary method utilizing a form of a substituent or a bond. One example of the representative synthesis route is shown below.

In the synthesis route above, a coupling reaction of Compound 1 and a 4-trimethylsilylphenylboronic acid is performed in the presence of a palladium catalyst to obtain Compound 2. Compound 2 is anionized with an equivalent of n-butyllithium or the like and then reacted with an excess amount of dimethyldichlorosilane, and thereafter, unreacted dimethyldichlorosilane is removed by distillation to obtain Compound 3. Compound 3 obtained is reacted with sodium cyclopentadienylide to obtain Compound 4, and Compound 4 is dianionized with 2 equivalents of n-butyllithium or the like and then reacted with zirconium tetrachloride to obtain Compound 5. The metallocene compound having introduced thereinto a substituent can be synthesized by using a corresponding raw material for substitution, and a corresponding substituent can be introduced into the 4-position of the indenyl ring by using a corresponding boronic acid, for example, 4-chlorophenylboronic acid, 4-methoxyphenylboronic acid, 5-methylfuryl-2-boronic acid, 4,5-dimethylfuryl-2-boronic acid or 2-thienylboronic acid, in place of 4-trimethylsilylphenylboronic acid.

IV-3. Olefin Polymerization Catalyst of the Present Invention Containing Olefin Polymerization Catalyst Components (A-1b) and (A-2b) of the Present Invention or Olefin Polymerization Catalyst of the Present Invention Containing Olefin Polymerization Catalyst Component (Ac) of the Present Invention

The olefin polymerization catalyst of the present invention comprises the following components (A) and (B) and, if desired, further contains the component (C):

component (A): the olefin polymerization catalyst component of the present invention specified above,

component (B): a compound capable of reacting with the component (A) to produce a cationic metallocene compound, and

component (C): a microparticle support.

The olefin polymerization catalyst of the present invention is described below item by item (hereinafter, the olefin polymerization catalyst component of the present invention is sometimes referred to as component (A) or simply as A).

IV-3(1). Component (B)

The olefin polymerization catalyst of the present invention contains, as the component (B), a compound capable of reacting with the metallocene compound of the component (A) to produce a cationic metallocene compound (hereinafter, sometimes referred to as component (B) or simply as B) and preferably contains the component (B) and a microparticle support (preferred component (C); hereinafter sometimes simply referred to as C).

One of the compounds (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound is an organoaluminum oxy compound.

The organoaluminum oxy compound has an Al—O—Al bond in the molecule, and the number of bonds is usually from 1 to 100, preferably from 1 to 50. Such an organoaluminum oxy compound is a product obtained usually by reacting an organoaluminum compound and water.

The reaction of an organoaluminum and water is usually performed in an inert hydrocarbon (solvent). As the inert hydrocarbon, an aliphatic hydrocarbon, an alicyclic hydrocarbon and an aromatic hydrocarbon, such as pentane, hexane, heptane, cyclohexane, methylcyclohexane, benzene, toluene and xylene, can be used, but it is preferred to use an aliphatic hydrocarbon or an aromatic hydrocarbon.

As the organoaluminum compound used for preparing the organoaluminum oxy compound, any of compounds represented by the following formula (11b) may be usable, but a trialkylaluminum is preferably used. R^(23b) _(t)AlX^(21b) _(3-t)  formula (11b) (wherein R^(23b) represents a hydrocarbon group having a carbon number of 1 to 18, preferably from 1 to 12, such as alkyl group, alkenyl group, aryl group and aralkyl group, X^(21b) represents a hydrogen atom or a halogen atom, and t represents an integer of 1≤t≤3).

The alkyl group of the trialkylaluminum may be any of a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group and the like, but among others, is preferably a methyl group.

Two or more of the organoaluminum compounds above can be also mixed and used.

The ratio between water and the organoaluminum compound in the reaction (molar ratio of water/Al) is preferably from 0.25/1 to 1.2/1, more preferably from 0.5/1 to 1/1. The reaction temperature is usually from −70 to 100° C., preferably from −20 to 20° C. The reaction time is selected in the range of usually from 5 minutes to 24 hours, preferably from 10 minutes to 5 hours. As the water required in the reaction, not only mere water but also crystal water contained, for example, in copper sulfate hydrate or aluminum sulfate hydrate or a component capable of producing water in the reaction system can be utilized.

Incidentally, out of the organoaluminum oxy compounds described above, those obtained by reacting an alkylaluminum with water is usually called aluminoxane and among others, methylaluminoxane (encompassing those substantially composed of methylaluminoxane (MAO)) is preferred as the organoaluminum oxy compound.

Of course, as the organoaluminum oxy compound, two or more of the organoaluminum oxy compounds described above may be used in combination. Also, the organoaluminum oxy compound may be used as a solution by dissolving or dispersing it in the above-described inert hydrocarbon solvent.

When an organoaluminum oxy compound is used as the component (B) of the olefin polymerization catalyst component of the present invention, the strain hardening (λmax) of the obtained ethylene-based polymer becomes high or Mz/Mw (where Mz is a Z average molecular weight measured by GPC and Mw is a weight average molecular weight measured by the same method) indicative of the high-molecular-weight component content becomes large and in turn, the moldability is advantageously more improved.

Other specific examples of the compound (B) capable of reacting with the metallocene compound (A) to form a cationic metallocene compound include a borane compound and a borate compound.

More specifically, examples of the borane compound include triphenylborane, tri(o-tolyl)borane, tri(p-tolyl)borane, tri(m-tolyl)borane, tri(o-fluorophenyl)borane, tris(p-fluorophenyl)borane, tris(m-fluorophenyl)borane, tris(2,5-difluorophenyl)borane, tris(3,5-difluorophenyl)borane, tris(4-trifluoromethylphenyl)borane, tris(3,5-ditrifluoromethylphenyl)borane, tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane, tris(perfluoronaphthyl)borane, tris(perfluorobiphenyl), tris(perfluoroanthryl)borane and tris(perfluorobinaphthyl)borane.

Among these compounds, preferred are tris(3,5-ditrifluoromethylphenyl)borane, tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane, tris(perfluoronaphthyl)borane, tris(perfluorobiphenyl)borane, tris(perfluoroanthryl)borane and tris(perfluorobinaphthyl)borane, and more preferred are tris(2,6-ditrifluoromethylphenyl)borane, tris(pentafluorophenyl)borane, tris(perfluoronaphthyl)borane and tris(perfluorobiphenyl)borane.

A first example of the borate compound is specifically a compound represented by the following formula (12b): [L^(1b)-H]⁺[BR^(24b)R^(25b)X^(31b)X^(32b)]⁻  formula (12b)

In formula (12b), L^(1b) is a neutral Lewis base, H is a hydrogen atom, and [L^(1b)-H] is a Broensted acid such as ammonium, anilinium and phosphonium.

Examples of the ammonium include a trialkyl-substituted ammonium such as trimethylammonium, triethylammonium, tripropylammonium, tributylammonium and tri(n-butyl)ammonium, and a dialkylammonium such as di(n-propyl)ammonium and dicyclohexylammonium.

Examples of the anilinium include an N,N-dialkylanilinium such as N,N-dimethylanilinium, N,N-diethylanilinium and N,N-2,4,6-pentamethylanilinium.

Furthermore, examples of the phosphonium include a triarylphosphonium and a trialkylphosphonium, such as triphenylphosphonium, tributylphosphonium, tri(methylphenyl)phosphonium and tri(dimethylphenyl)phosphonium.

In formula (12b), each of R^(24b) and R^(25b) is independently the same or different aromatic or substituted aromatic hydrocarbon group having a carbon number of 6 to 20, preferably from 6 to 16, and these groups may be connected with each other through a bridging group. The substituent of the substituted aromatic hydrocarbon group is preferably an alkyl group typified by a methyl group, an ethyl group, a propyl group and an isopropyl group, or a halogen atom such as fluorine, chlorine, bromine and iodine.

Furthermore, each of X^(31b) and X³² is independently a hydride group, a halide group, a hydrocarbon group having a carbon number of 1 to 20, or a substituted hydrocarbon group having a carbon number of 1 to 20, in which one or more hydrogen atoms are substituted for by a halogen atom.

Specific examples of the compound represented by formula (12b) include tributylammoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tributylammoniumtetra(3,5-ditrifluoromethylphenyl)borate, tributylammoniumtetra(2,6-difluorophenyl)borate, tributylammoniumtetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluoronaphthyl)borate, dimethylaniliniumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate, dimnethylaniliniumtetra(2,6-difluorophenyl)borate, dimethylaniliniiuntetra(perfluoronaphdthyl)borate, triphenylphosphoniumtetra(pentafluorophenyl)borate, triphenylphosphoniumtetra(2,6-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(3,5-ditrifluoromethylphenyl)borate, triphenylphosphoniumtetra(2,6-difluorophenyl)borate, triphenylphosphoniumtetra(perfluoronaphthyl)borate, trimethylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(pentafluorophenyl)borate, triethylanmmoniumtetra(2,6-ditrifluoromethylphenyl)borate, triethylammoniumtetra(perfluoronaphthyl)borate, tripropylammoniumtetra(pentafluorophenyl)borate, tripropylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tripropylanunoniumtetra(perfluoronaphthyl)borate, di(1-propyl)ammoniumtetra(pentafluorophenyl)borate, and dicyclohexylammoniumtetraphenylborate.

Among these, preferred are tributylammnoniumtetra(pentafluorophenyl)borate, tributylammoniumtetra(2,6-ditrifluoromethylphenyl)borate, tributylanummoniumtetra(3,5-ditrifluoromethylphenyl)borate, tributylammoniumtetra(perfluoronaphthyl)borate, dimethylaniliniumtetra(pentafluoropheuyl)borate, dimethylanilinumtetra(2,6-ditrifluoromethylphenyl)borate, dimethylaniliniumtetra(3,5-ditrifluoromethylphenyl)borate and dimethylaniliniumtetra(perfluoronaphthyl)borate.

A second example of the borate compound is represented by the following formula (13b): [L^(2b)]⁺[BR^(26b)R^(27b)X^(41b)X^(42b)]  formula (13b)

In formula (13b), L^(2b) includes, for example, a carbo-cation, a methyl cation, an ethyl cation, a propyl cation, an isopropyl cation, a butyl cation, an isobutyl cation, a tert-butyl cation, a pentyl cation, a tropinium cation, a benzyl cation, a trityl cation, a sodium cation, and a proton. R^(26b), R^(27b), X^(41b) and X^(42b) have the same definitions as in formula (12b).

Specific examples of the compound above include trityltetraphenylborate, trityltetra(o-tolyl)borate, trityltetra(p-tolyl)borate, trityltetra(m-tolyl)borate, trityltetra(o-fluorophenyl)borate, trityltetra(p-fluorophenyl)borate, trityltetra(m-fluorophenyl)borate, trityltetra(3,5-difluorophenyl)borate, trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylpheuyl)borate, trityltetra(perfluoronaphthyl)borate, tropinium-tetraphenylborate, tropinium-tetra(o-tolyl)borate, tropinium-tetra(p-tolyl)borate, tropinium-tetra(m-tolyl)borate, tropinium-tetra(o-fluorophenyl)borate, tropinium-tetra(p-fluorophenyl)borate, tropinium-tetra(m-fluorophenyl)borate, tropinium-tetra(3,5-difluorophenyl)borate, tropinium-tetra(pentafluorophenyl)borate, tropinium-tetra(2,6-ditrifluoromethylphenyl)borate, tropinium-tetra(3,5-ditrifluoromethylphenyl)borate, tropinium-tetra(perfluoronaphthyl)borate, NaBPh₄, NaB(o-CH₃-Ph)₄, NaB(p-CH₃-Ph)₄, NaB(m-CH₃-Ph)₄, NaB(o-F-Ph)₄, NaB(p-F-Ph)₄, NaB(m-F-Ph)₄, NaB(3,5-F₂-Ph)₄, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, NaB(3,5-(CF₃)₂-Ph)₄, NaB(C₁₀F₇)₄, HBPh₄.2-diethyl ether, H⁺B(3,5-F₂-Ph)₄.2-diethyl ether, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)-Ph)₄.2-diethyl ether, and H⁺B(C₁₀H₇)₄.2-diethyl ether.

Among these, preferred are trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, trityltetra(3,5-ditrifluoromethylphenyl)borate, trityltetra(perfluoronaphthyl)borate, tropinium-tetra(pentafluorophenyl)borate, tropinium-tetra(2,6-ditrifluoromethylphenyl)borate, tropinium-tetra(3,5-ditrifluoromethylphenyl)borate, tropinium-tetra(perfluoronaphthyl)borate, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, NaB(3,5-(CF₃)₂-Ph)₄, NaB(C₁₀F₇)₄, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)₂-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)₂-Ph)₄.2-diethyl ether and H⁺B(C₁₀H₇)₄.2-diethyl-ether.

Among these, still more preferred are trityltetra(pentafluorophenyl)borate, trityltetra(2,6-ditrifluoromethylphenyl)borate, tropinium-tetra(pentafluorophenyl)borate, tropinium-tetra(2,6-ditrifluoromethylphenyl)borate, NaB(C₆F₅)₄, NaB(2,6-(CF₃)₂-Ph)₄, H⁺B(C₆F₅)₄ ⁻.2-diethyl ether, H⁺B(2,6-(CF₃)₂-Ph)₄.2-diethyl ether, H⁺B(3,5-(CF₃)₂-Ph)₄.2-diethyl ether and H⁺B(C₁₀H₇)₄.2-diethyl ether.

When a borane compound or a borate compound is used as the catalyst component (B), the polymerization activity or copolymerizability is increased and therefore, the productivity of an ethylene-based polymer having a long-chain branch is enhanced.

Also, a mixture of the above-described organoaluminum oxy compound and the above-described borane or borate compound may be also used as the component (B) of the olefin polymerization catalyst. Furthermore, two or more of those borane or borate compounds may be mixed and used.

As other specific examples of the compound (B) capable of reacting with the metallocene compound (A) to form a cationic metallocene compound, a compound having the same action as the above-described organoaluminum oxy compound or the above-described borane or borate compound, such as clay, clay mineral, ion-exchanging layered compound and inorganic silicate described, for example, in JP-A-8-127613 and solid oxide compound described, for example, JP-T-2002-515522, may be also used in the same manner.

IV-3(2). Preferred Component (C)

The microparticle support as the preferred component (C) of the olefin polymerization catalyst of the present invention includes an inorganic support, a particulate polymer support, and a mixture thereof. As the inorganic support, a metal, a metallic oxide, a metallic chloride, a metallic carbonate, a carbonaceous substance, or a mixture thereof can be used.

Preferred examples of the metal that can be used for the inorganic support include iron, aluminum, and nickel.

The metallic oxide includes a single oxide or a composite oxide of elements belonging to Groups 1 to 14 of the periodic table, and examples thereof include various natural or synthetic, single or composite oxides such as SiO₂, Al₂O₃, MgO, CaO, B₂O₃, TiO₂, ZrO₂, Fe₂O₃, Al₂O₃.MgO, Al₂O₃.CaO, Al₂O₃.SiO₂, Al₂O₃.MgO.CaO, Al₂O₃.MgO.SiO₂, Al₂O₃.CuO, Al₂O₃.Fe₂O₃, Al₂O₃.NiO and SiO₂.MgO. Here, these formulae are not a molecular formula but indicate only a composition, and the structure and component ratio of the composite oxide for use in the present invention are not particularly limited.

Also, the metallic oxide for use in the present invention may have absorbed a small amount of water or may contain a small amount of impurities.

As the metallic chloride, for example, a chloride of an alkali metal or an alkaline earth metal is preferred, and specifically, MgCl₂, CaCl₂ and the like are suited in particular.

As the metallic carbonate, a carbonate of an alkali metal or an alkaline earth metal is preferred, and specific examples thereof include magnesium carbonate, calcium carbonate, and barium carbonate.

The carbonaceous substance includes, for example, carbon black and activated carbon.

All of these inorganic supports can be suitably used in the present invention, but among others, use of a metallic oxide, silica, alumina or the like is preferred.

Such an in organic support is preferably used by burning it in an air or an inert gas such as nitrogen or argon at a temperature of usually from 200 to 800° C., preferably from 400 to 600° C., thereby adjusting the amount of a surface hydroxyl group to be from 0.8 to 1.5 mmol/g.

The property of the inorganic support is not particularly limited, but it is usually preferred to use an inorganic support having an average particle diameter of 5 to 200 μm, preferably from 10 to 150 μm, an average pore diameter of 20 to 1,000 Å, preferably from 50 to 500 Å, a specific surface area of 150 to 1,000 m²/g, preferably from 200 to 700 m²/g, a pore volume of 0.3 to 2.5 cm³/g, preferably from 0.5 to 2.0 cm³/g, and an apparent specific gravity of 0.20 to 0.50 g/cm³, preferably from 0.25 to 0.45 g/cm³.

The inorganic support may be of course used as it is but may be used after applying a preliminary treatment of contacting such a support with an organoaluminum compound such as trimethylaluminum, triethylaluminum, triisobutylaluminum, trihexylaluminum, tripropylaluminum, tributylaluminum, trioctylaluminum, tridecylaluminum and diisobutylaluminum hydride, or an organoaluminum oxy compound containing an Al—O—Al bond.

In addition, a powder of the component (A) or component (B) can be also used as the microparticle support.

IV-3(3). Preparation Method of Olefin Polymerization Catalyst of the Present Invention

At the time of obtaining an olefin polymerization catalyst by using an olefin polymerization catalyst component containing (A) a metallocene compound as an essential component of the olefin polymerization catalyst component of the present invention, (B) a compound, as the same essential component, capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound, and (C) a microparticle support as a preferred component, the method for contacting respective components is not particularly limited and, for example, the following methods can be arbitrarily employed.

(I) A method of contacting the metallocene compound (A) with the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound and thereafter, contacting the microparticle support (C).

(II) A method of contacting the metallocene compound (A) with the microparticle support (C) and thereafter, contacting the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound.

(III) A method of contacting the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound with the microparticle support (C) and thereafter, contacting the metallocene compound (A).

Among these contacting methods, the methods of (I) and (III) are preferred, and the method of (I) is most preferred. In the contacting methods above, the essential component (A-1b) and the essential component (A-2b), which are the metallocene compound (A), may be treated after mixing or may be separately treated, and, for example, a method of using the component (A-1 b) by the method of (I) among specific examples above and using the component (A-2b) by the method of (III) may be also employed.

In all of these contacting methods, generally, a method of contacting respective components with or without stirring in an inert atmosphere of nitrogen, argon or the like in the presence of a liquid inert hydrocarbon, for example, an aromatic hydrocarbon (usually having a carbon number of 6 to 12) such as benzene, toluene, xylene and ethylbenzene, or an aliphatic or alicyclic hydrocarbon (usually having a carbon number of 5 to 12) such as heptane, hexane, decane, dodecane and cyclohexane, is usually employed.

This contact is preferably performed usually at a temperature of −100 to 200° C., preferably from −50 to 100° C., more preferably from 0 to 50° C., for 5 minutes to 50 hours, preferably from 30 minutes to 24 hours, more preferably from 30 minutes to 12 hours.

Also, at the time of containing the metallocene compound (A), the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound, and the microparticle support (C), as described above, both an aromatic hydrocarbon solvent in which a certain component is soluble or sparingly soluble, and an aliphatic or alicyclic hydrocarbon solvent in which a certain component is insoluble or sparingly soluble, can be used.

In the case of stepwise performing the contact reaction of respective components with each other, the solvent and the like used in the previous stage need not be removed but may be used directly for the solvent in the contact reaction in the latter stage. Also, after the previous-stage contact reaction using a soluble solvent, the desired product may be collected as a solid matter by adding a liquid inert hydrocarbon (for example, an aliphatic hydrocarbon, an alicyclic hydrocarbon or an aromatic hydrocarbon, such as pentane, hexane, decane, dodecane, cyclohexane, benzene and toluene) in which a certain component is insoluble or sparingly soluble, or the desired product may be taken out as a solid matter by once removing a part or the whole of the soluble solvent by means of drying or the like, and thereafter, the latter-stage contact reaction of the desired product may be performed using any of the above-described inert hydrocarbon solvents. In the present invention, the contact reaction of respective components may be performed a plurality of times.

In the present invention, the ratio at which the metallocene compound (A), the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound, and the microparticle support (C) are used is not particularly limited, but the following ranges are preferred.

The ratio between the component (A-1b) and the component (A-2b) that are the metallocene compound (A) is set in an arbitrary range according to the material properties required of the olefin-based polymer as a final product but usually, letting the total of both components be 100, the ratio is from 1:99 to 99.9:0.1, preferably from 5:95 to 99.5:0.5, more preferably from 10:90 to 99.5:0.5, still more preferably from 20:80 to 99.5:0.5, yet still more preferably from 40:60 to 99.2:0.8. If the ratio of the component (A-1b) is less than 1, the moldability of a olefin-based polymer as the product may not be enhanced due to lacking in production of a macromer and insufficient formation of a long-chain branch, or since the component (A-2b) for producing a polymer having a higher molecular weight becomes a main active species, polymerization must be performed under the condition having much hydrogen that is a molecular weight adjusting agent, namely, under the condition disadvantageous for production of a long-chain branch, as a result, the moldability is still not enhanced or a polymer produced from a small amount of the component (A-1b) is more reduced in the molecular weight, making the product sticky, which is not preferred. If the ratio of the component (A-1b) exceeds 99.9, it becomes difficult to sufficiently increase the molecular weight of the produced polymer, or the long-chain branch does not grow to a high enough molecular weight, disadvantageously failing in enhancing the moldability. In this connection, selection of the molar ratio between the component (A-1b) and the component (A-2b) varies depending on whether the olefin polymerization activities of both components greatly differ or are at the same level, and therefore, needless to say, the molar ratio must be consistently optimized according to the material properties of the target olefin-based polymer.

In the case of using an organoaluminum oxy compound as the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound, the atom ratio (Al/M) of aluminum of the organoaluminum oxy compound to the transition metal (M) in the metallocene compound (A) is usually from 1 to 100,000, preferably from 5 to 1,000, more preferably from 50 to 200. In the case of using a borane compound or a borate compound, the atom ratio (B/M) of boron to the transition metal (M) in the metallocene compound is preferably selected in the range of usually from 0.01 to 100, preferably from 0.1 to 50, more preferably from 0.2 to 10.

Furthermore, in the case of using a mixture of an organoaluminum oxy compound and a borane or borate compound as the compound (B) for producing a cationic metallocene compound, each compound in the mixture is preferably used at the same ratio to the transition metal (M) as above.

The amount of the microparticle support (C) used is preferably 1 g for 0.0001 to 5 mmol, preferably for 0.001 to 0.5 mmol, more preferably for 0.01 to 0.1 mmol, of the transition metal in the metallocene compound (A).

The metallocene compound (A), the compound (B) capable of reacting with the metallocene compound (A) to produce a cationic metallocene compound, and the microparticle support (C) are contacted by any one of the contacting methods (I) to (III) above and thereafter, the solvent is removed, whereby the olefin polymerization catalyst can be obtained as a solid catalyst. The removal of the solvent is preferably performed under atmospheric pressure or reduced pressure at 0 to 200° C., preferably at 20 to 150° C., for 1 minute to 50 hours, preferably for 10 minutes to 10 hours.

Incidentally, the olefin polymerization catalyst can be also obtained by the following method.

(IV) The metallocene compound (A) and the microparticle support (C) are contacted and after removing the solvent, the obtained solid catalyst component is brought into contact with an organoaluminum oxy compound, a borane compound, a borate compound or a mixture thereof.

(V) An organoaluminum oxy compound, a borane compound, a borate compound or a mixture thereof is brought into contact with the microparticle support (C) and after removing the solvent, the obtained solid catalyst component is brought into contact with the metallocene compound (A) under polymerization conditions.

Also in these contacting methods of (IV) and (V), the same conditions as above can be used for the component ratio, the contacting conditions and the solvent removing conditions.

The thus-obtained olefin polymerization catalyst may be used after performing preliminary polymerization of a monomer, if desired.

It is also preferred that the olefin polymerization catalyst component or olefin polymerization catalyst of the present invention further contains a component (D): an organoaluminum compound. Examples of the organoaluminum compound used here include an organoaluminum compound described also in formula (11b), such as trimethylaluminum, triethylaluminum, triisobutylaluminum, diethylaluminum chloride and ethylaluminum dichloride; an alkoxide having a carbon number of 1 to 18, preferably from 1 to 12, such as diethylaluminum ethoxide, ethylaluminum diethoxide and dimethylaluminum ethoxide; an organoaluminum compound having an oxygen-containing hydrocarbon group, such as alkenyloxy; the above-described organoaluminum oxy compound; and a modified organoaluminum compound having a branched alkyl group. Among these, trimethylaluminum, triethylaluminum, triisobutylaluminum, diethylaluminum chloride, ethylaluminum dichloride and diethylaluminum ethoxide are preferred, triethylaluminum, triisobutylaluminum and diethylaluminum chloride are more preferred, triethylaluminum and triisobutylaluminum are still more preferred, and triethylaluminum is yet still more preferred.

IV-4. Use of Olefin Polymerization Catalyst of the Present Invention

The olefin polymerization catalyst of the present invention can be used for homopolymerization of an olefin or for copolymerization of an olefin and another olefin.

Here, the olefin includes an olefin having a carbon number of 2 to 30, preferably from 2 to 8, and is preferably ethylene or an α-olefin. Specific examples thereof include ethylene, propylene, 1-butene, 1-hexene, 1-octene, and 4-methyl-1-pentene. Homopolymerization of ethylene or copolymerization of ethylene and the α-olefin above is more preferred, and homopolymerization of ethylene, copolymerization of ethylene⋅propylene, copolymerization of ethylene⋅1-butene, copolymerization of ethylene⋅1-hexene, or copolymerization of ethylene⋅1-octene is still more preferred.

As the olefin, it is also possible to copolymerize three or more kinds of olefins.

The copolymerization may be any of alternating copolymerization, random copolymerization and block copolymerization. In the case of copolymerizing ethylene with another α-olefin, the amount of the another α-olefin may be arbitrarily selected in the range of 90 mol % or less of all monomers but is generally 40 mol % or less, preferably 30 mol % or less, more preferably 10 mol % or less. Of course, a small amount of a comonomer other than ethylene and an α-olefin may be used, and in this case, the comonomer includes a compound having a polymerizable double bond, for example, styrenes such as styrene, 4-methylstyrene and 4-dimethylaminostyrene, dienes such as 1,4-butadiene, 1,5-hexadiene, 1,4-hexadiene and 1,7-octadiene, a cyclic compound such as norbomene and cyclopentene, and oxygen-containing compounds such as hexenol, hexenoic acid and methyl octenoate.

In the present invention, the polymerization reaction may be performed preferably by slurry polymerization or gas phase polymerization in the presence of the above-described catalyst, preferably a supported catalyst.

In the case of slurry polymerization, ethylene or the like is polymerized, while substantially blocking oxygen, water and the like, in the presence or absence of an inert hydrocarbon solvent selected from an aliphatic hydrocarbon such as isobutane, hexane and heptane, an aromatic hydrocarbon such as benzene, toluene and xylene, and an alicyclic hydrocarbon such as cyclohexane and methylcyclohexane. Needless to say, a liquid monomer such as liquid ethylene and liquid propylene can be also used as the solvent.

In the case of gas phase polymerization, ethylene or the like is polymerized in a reactor in which a gas flow of ethylene or a comonomer is introduced, distributed or circulated.

In the present invention, the polymerization is more preferably gas phase polymerization. The polymerization conditions usually employed are such that the temperature is from 0 to 250° C., preferably from 20 to 110° C., more preferably from 60 to 100° C., the pressure is from atmospheric pressure to 10 MPa, preferably from atmospheric pressure to 4 MPa, more preferably from 0.5 to 2 MPa, and the polymerization time is from 5 minutes to 10 hours, preferably from 5 minutes to 5 hours.

The molecular weight of the produced polymer may be adjusted to a certain extent by changing the polymerization conditions such as polymerization temperature and molar ratio of catalyst, but the molecular weight can be more effectively adjusted by adding hydrogen to the polymerization reaction system.

Also, even when a component aiming at removing water, so-called a scavenger, is added to the reaction system, the polymerization can be performed without causing any trouble.

Examples of the scavenger used here include the organoaluminum compound described also in formula (11b) above, such as trimethylaluminum, triethylaluminum and triisobutylaluminum; the above-described organoaluminum oxy compound; a modified organoaluminum compound having a branched alkyl; an organozinc compound such as diethylzinc and dibutylzinc; an organomagnesium compound such as diethylmagnesium, dibutylmagnesium and ethylbutylmagnesium; and a Grignard compound such as ethylmagnesium chloride and butylmagnesium chloride. Among these, triethylaluminum, triisobutylaluminum and ethylbutylmagnesium are preferred, and triethylaluminum is more preferred.

The present invention can be applied without any trouble also for a multistage polymerization system consisting of two or more stages, in which polymerization conditions such as hydrogen concentration, monomer amount, polymerization pressure and polymerization temperature are different from one another.

[V] Production Method of Ethylene-Base Polymer of the Present Invention

A fourth aspect of the present invention is to provide a metallocene-based polyolefin having a sufficient number of long-chain branches having an appropriate length, preferably a metallocene-based polyethylene having a sufficient number of long-chain branches having an appropriate length. The fourth aspect of the present invention is described below item by item.

V-1. Olefin Polymerization Catalyst

The production method of an olefin-based polymer of the present invention, preferably the production method of an ethylene-based polymer, is performed using an olefin polymerization catalyst containing the following components (A) and (B) and, if desired, containing the component (C).

Component (A): at least any one of the following catalyst components:

(A-i) an olefin polymerization catalyst component containing the components (A-1b) and (A-2b) described in Item IV-1,

(A-ii) an olefin polymerization catalyst component containing the component (Ac) described in Item IV-2, and

(A-iii) an olefin polymerization catalyst component containing a metallocene compound represented by the following formula (1d):

[in formula (1d), M^(1d) represents any one transition metal of Ti, Zr and Hf; each of X^(1d) and X^(2d) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1d) and Q^(2d) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1d) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1d) may combine to form a ring together with Q^(1d) and Q^(2d); m^(d) is 0 or 1 and when m^(d) is 0, Q^(1d) is bonded directly to the conjugated 5-membered ring including R^(2d) and R^(3d); each of R^(2d) and R^(3d) represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, provided that at least one R^(2d) is not a hydrogen atom; R^(4d) represents a saturated or unsaturated divalent hydrocarbon group having a carbon number of 4 or 5 for forming a condensed ring with the 5-membered ring to which R^(4d) is bonded; R^(5d) is an atom or a group bonded to a carbon atom of R^(4d) and each independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and n^(d) represents an integer of 0 to 10 and when n^(d) is 2 or more, at least two R^(5d) may form a ring together with the carbon atoms to which R^(5d) are bonded],

Component (B): a compound capable of reacting with a metallocene compound of the component (A) to produce a cationic metallocene compound, and

Component (C): a microparticle support.

The olefin polymerization catalyst used in the production method of an ethylene-based polymer, described as (A-iii) above, is characterized by containing a metallocene compound (Ad) represented by formula (1d) as an essential component.

In formula (1d). M^(1d) of the metallocene compound represents Ti, Zr or Hf. M^(1d) of the metallocene compound preferably represents Zr or Hf, and M^(1d) of the metallocene compound more preferably represents Zr.

Each of X^(1d) and X^(2d) independently includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a methoxymethyl group, an ethoxymethyl group, an n-propoxymethyl group, an i-propoxymethyl group, an n-butoxymethyl group, an i-butoxymethyl group, a tert-butoxymethyl group, a methoxyethyl group, an ethoxyethyl group, an acetyl group, a 1-oxopropyl group, a 1-oxo-n-butyl group, a 2-methyl-1-oxopropyl group, a 2,2-dimethyl-1-oxo-propyl group, a phenylacetyl group, a diphenylacetyl group, a benzoyl group, a 2-methoxyphenyl group, a 3-methoxyphenyl group, a 4-methoxyphenyl group, a 2-furyl group, a 2-tetrahydrofuryl group, a dimethylaminomethyl group, a diethylaminomethyl group, a di-i-propylaminomethyl group, a bis(dimethylamino)methyl group, a bis(di-i-propylamino)methyl group, a (dimethylamino)(phenyl)methyl group, a methylimino group, an ethylimino group, a 1-(methylimino)ethyl group, a 1-(phenylimino)ethyl group, a 1-[(phenylmethyl)imino]ethyl group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an i-butoxy group, a tert-butoxy group, a phenoxy group, a dimethylamino group, a diethylamino group, a di-n-propylamino group, a di-i-propylamino group, a di-n-butylamino group, a di-i-butylamino group, a di-tert-butylamino group, and a diphenylamino group.

Specific preferred examples of X^(1d) and X^(2d) include a chlorine atom, a bromine atom, a methyl group, an n-butyl group, an i-butyl group, a methoxy group, an ethoxy group, an i-propoxy group, an n-butoxy group, a phenoxy group, a dimethylamino group, and a di-i-propylamino group. Among these specific examples, a chlorine atom, a methyl group and a dimethylamino group are more preferred.

Each of Q^(1d) and Q^(2d) independently represents a carbon atom, a silicon atom or a germanium atom and is preferably a carbon atom or a silicon atom, more preferably a silicon atom.

Each R^(1d) independently includes, for example, a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, and a phenyl group. In the case where R^(1d) forms a ring together with Q^(1d) and Q^(2d), examples include a cyclobutylidene group, a cyclopentylidene group, a cyclohexylidene group, a silacyclobutyl group, a silacyclopentyl group, and a silacyclohexyl group.

When Q^(1d) or/and Q^(2d) are a carbon atom, specific preferred examples of R^(1d) include a hydrogen atom, a methyl group, an ethyl group, a phenyl group and a cyclobutylidene group, and when Q^(1d) or/and Q^(2d) are a silicon atom, specific preferred examples include a methyl group, an ethyl group, a phenyl group and a silacyclobutyl group.

Each of R^(2d) and R^(3d) includes, for example, a hydrogen atom, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 3,5-dimethylphenyl group, a 4-tert-butylphenyl group, a 3,5-di-tert-butylphenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 4-trifluoromethylphenyl group, a furyl group, a tetrahydrofuryl group, a 2-methylfuryl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

Each of R^(2d) and R^(3d) is preferably a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, because the polymerization activity becomes high in particular. Furthermore, R^(2d) is preferably a hydrocarbon group having a carbon number of 1 to 20, because the moldability of the polyethylene is excellent in particular.

Specific preferred examples of R^(2d) and R^(3d) include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a 2-methylfuryl group, and a trimethylsilyl group. Among these specific examples, a hydrogen atom, a methyl group, an n-butyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are more preferred, and a hydrogen atom, a methyl group, a tert-butyl group, a phenyl group and a trimethylsilyl group are still more preferred.

Specific examples of the condensed cyclopentadienyl structure formed by R^(4d) and a cyclopentadienyl moiety to which R^(4d) is bonded, include the following partial structures (I) to (VI).

Among these specific examples, (I), (III) and (VI) are preferred. Also, R^(5d) may be substituted on these partial structures (I) to (VI).

The substituent R^(5d) includes, in addition to a hydrogen atom, for example, a chlorine atom, a bromine atom, an iodine atom, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a tert-butyl group, an n-pentyl group, a neopentyl group, a cyclopentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a benzyl group, a 2-methylphenyl group, a 3-methylphenyl group, a 4-methylphenyl group, a 4-tert-butylphenyl group, a 3,5-dimethylphenyl group, a 3,5-di-tert-butylphenyl group, a naphthyl group, an anthracenyl group, a bis(trimethylsilyl)methyl group, a bis(tert-butyldimethylsilyl)methyl group, a bromomethyl group, a chloromethyl group, a 2-chloroethyl group, a 2-bromoethyl group, a 2-bromopropyl group, a 3-bromopropyl group, a 2-bromocyclopentyl group, a 2,3-dibromocyclopentyl group, a 2-bromo-3-iodocyclopentyl group, a 2,3-dibromocyclohexyl group, a 2-chloro-3-iodocyclohexyl group, a 2-chlorophenyl group, a 4-chlorophenyl group, a 2,3,4,5,6-pentafluorophenyl group, a 2,6-dichloro-4-trimethylsilylphenyl group, a trimethylsilyl group, a tri-tert-butylsilyl group, a di-tert-butylmethylsilyl group, a tert-butyldimethylsilyl group, a triphenylsilyl group, a diphenylmethylsilyl group, and a phenyldimethylsilyl group.

In the case where two or more R^(5d) form a ring together with the carbon atoms to which R^(5d) are bonded, examples include a benz[e]indenyl group, a benz[f]indenyl group, a 6,7-dihydroindacenyl group, a 5,5,7,7-tetramethyl-6,7-dihydroindacenyl group, a 5,6,7,8-tetrahydro-benz[f]indenyl group, and a 5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-benz[f]indenyl group.

Specific preferred examples of R^(5d) include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a cyclohexyl group, a phenyl group, a naphthyl group, and a trimethylsilyl group.

In formula (1d), m^(d) is 0 or 1 and when m^(d) is 0, Q^(1d) is bonded directly to the conjugated 5-membered ring including R^(3d). Furthermore, n^(d) represents an integer of 0 to 10 and when n^(d) is 2 or more, at least two R^(5d) may form a ring together with the carbon atoms to which R^(5d) are bonded.

As the olefin polymerization catalyst according to the present invention, the metallocene compound of the essential component (Ad) is preferably a compound represented by the following formula (2d):

In the metallocene compound represented by formula (2d), for M^(1d), X^(1d), X^(2d), Q^(1d), R^(1d), R^(2d), R^(3d), R^(4d) and R^(5d), the same structures as the atoms and groups described in the metallocene compound represented by formula (1d) may be selected.

As the olefin polymerization catalyst according to the present invention, the metallocene compound of the essential component (Ad) is more preferably a compound represented by the following formula (3d):

In the metallocene compound represented by formula (3d), for M^(1d), X^(1d), X^(2d), Q^(1d), R^(1d) and R^(2d), the same structures as the atoms and groups described in the metallocene compound represented by formula (1d) may be selected.

Specific examples of the metallocene compound as the essential component (Ad) of the olefin polymerization catalyst for use in the production method of an ethylene-based polymer of the present invention are shown by formula (4d) and in Tables d-1 to d-4 below, but the present invention is not limited thereto. In Tables d-1 to d-4. TMS stands for trimethylsilyl, Ind stands for an indenyl group, and Cp stands for a cyclopentadienyl group.

Incidentally, the number indicating the position of each substituent on the cyclopentadienyl ring and indenyl ring of metallocene compounds recited as specific examples is as shown in the following formula (5d).

TABLE d-1 Ind-3-R^(3d)- No. M^(1d) X^(1d), X^(2d) R^(1d) ₂Q^(1d) Cp-2,3,4,5-R^(2d) ₄ 4,5,6,7-R^(5d) ₄  1d Zr Cl Me₂Si 4-tBu-Cp Ind  2d Zr Cl Me₂Si 3-tBu-Cp Ind  3d Zr Cl Me₂Si 4-TMS-Cp Ind  4d Zr Cl Me₂Si 3-TMSCp Ind  5d Zr Cl Me₂Si 4-Me-Cp Ind  6d Zr Cl Me₂Si 3-Me-Cp Ind  7d Zr Cl Me₂Si 4-Et-Cp Ind  8d Zr Cl Me₂Si 3-Et-Cp Ind  9d Zr Cl Me₂Si 4-nPr-Cp Ind 10d Zr Cl Me₂Si 3-nPr-Cp Ind 11d Zr Cl Me₂Si 4-iPr-Cp Ind 12d Zr Cl Me₂Si 3-iPr-Cp Ind 13d Zr Cl Me₂Si 4-nBu-Cp Ind 14d Zr Cl Me₂Si 3-nBu-Cp Ind 15d Zr Cl Me₂Si 4-iBu-Cp Ind 16d Zr Cl Me₂Si 3-iBu-Cp Ind 17d Zr Cl Me₂Si 4-Ph-Cp Ind 18d Zr Cl Me₂Si 3-Ph-Cp Ind 19d Zr Cl Me₂Si 4-Et₃Si-Cp Ind 20d Zr Cl Me₂Si 3-Et₃Si-Cp Ind 21d Zr Cl Me₂Si 4-nPr₃Si-Cp Ind 22d Zr Cl Me₂Si 3-nPr₃Si-Cp Ind 23d Zr Cl Me₂Si 4-nBu₃Si-Cp Ind 24d Zr Cl Me₂Si 3-nBu₃Si-Cp Ind 25d Zr Cl Me₂Si 4-iBu₃Si-Cp Ind 26d Zr Cl Me₂Si 3-iBu₃Si-Cp Ind 27d Zr Cl Me₂Si 4-tri-n-pentylsilyl-Cp Ind 28d Zr Cl Me₂Si 3-tri-n-pentylsilyl-Cp Ind 29d Zr Cl Me₂Si 4-tri-n-hexylsilyl-Cp Ind 30d Zr Cl Me₂Si 3-tri-n-hexylsilyl-Cp Ind 31d Zr Cl Me₂Si 4-trivinylsilyl-Cp Ind 32d Zr Cl Me₂Si 3-trivinylsilyl-Cp Ind 33d Zr Cl Me₂Si 4-Ph₃Si-Cp Ind 34d Zr Cl Me₂Si 3-Ph₃Si-Cp Ind

TABLE d-2 (continued) Ind-3-R^(3d)- X^(1d), 4,5, No. M^(1d) X^(2d) R^(1d) ₂Q^(1d) Cp-2,3,4,5-R^(2d) ₄ 6,7-R^(5d) ₄ 35d Zr Cl Me₂Si 4-tribenzylsilyl-Cp Ind 36d Zr Cl Me₂Si 3-tribenzylsilyl-Cp Ind 37d Zr Cl Me₂Si 4-tBuMe₂Si-Cp Ind 38d Zr Cl Me₂Si 3-tBuMe₂Si-Cp Ind 39d Zr Cl Me₂Si 2,4-Me₂-Cp Ind 40d Zr Cl Me₂Si 3,5-Me₂-Cp Ind 41d Zr Cl Me₂Si 2,4,5-Me₃-Cp Ind 42d Zr Cl Me₂Si 2,3,5-Me₃-Cp Ind 43d Zr Cl Me₂Si 2,3,4,5-Me₄-Cp Ind 44d Zr Cl Me₂Si 2-Me-4-Ph-Cp Ind 45d Zr Cl Me₂Si 3-Ph-5-Me-Cp Ind 46d Zr Me Me₂Si 4-tBu-Cp Ind 47d Zr Me Me₂Si 3-tBu-Cp Ind 48d Zr Me Me₂Si 4-TMS-Cp Ind 49d Zr Me Me₂Si 3-TMS-Cp Ind 50d Zr Me Me₂Si 4-Me-Cp Ind 51d Zr Me Me₂Si 3-Me-Cp Ind 52d Zr Ph Me₂Si 4-tBu-Cp Ind 53d Zr Ph Me₂Si 3-tBu-Cp Ind 54d Zr Ph Me₂Si 4-TMS-Cp Ind 55d Zr Ph Me₂Si 3-TMSCp Ind 56d Zr NMe₂ Me₂Si 4-tBu-Cp Ind 57d Zr NMe₂ Me₂Si 3-tBu-Cp Ind 58d Zr NMe₂ Me₂Si 4-TMS-Cp Ind 59d Zr NMe₂ Me₂Si 3-TMSCp Ind 60d Zr Cl Et₂Si 4-tBu-Cp Ind 61d Zr Cl Et₂Si 3-tBu-Cp Ind 62d Zr Cl Et₂Si 4-TMS-Cp Ind 63d Zr Cl Et₂Si 3-TMSCp Ind 64d Zr Cl Et₂Si 4-Ph-Cp Ind 65d Zr Cl Et₂Si 3-Ph-Cp Ind 66d Zr Cl Ph₂Si 4-tBu-Cp Ind 67d Zr Cl Ph₂Si 3-tBu-Cp Ind 68d Zr Cl Ph₂Si 4-TMS-Cp Ind 69d Zr Cl Ph₂Si 3-TMSCp Ind 70d Zr Cl Ph₂Si 4-Ph-Cp Ind 71d Zr Cl Ph₂Si 3-Ph-Cp Ind 72d Zr Cl silacyclobutyl 4-tBu-Cp Ind 73d Zr Cl silacyclobutyl 3-tBu-Cp Ind 74d Zr Cl silacyclobutyl 4-TMS-Cp Ind 75d Zr Cl silacyclobutyl 3-TMSCp Ind

TABLE d-3 (continued) Cp-2, Ind-3-R^(3d)- No. M^(1d) X^(1d), X^(2d) R^(1d) ₂Q^(1d) 3,4,5-R^(2d) ₄ 4,5,6,7-R^(5d) ₄ 76d Zr Cl silacyclobutyl 4-Ph-Cp Ind 77d Zr Cl silacyclobutyl 3-Ph-Cp Ind 78d Zr Cl H₂C 4-tBu-Cp Ind 79d Zr Cl H₂C 3-tBu-Cp Ind 80d Zr Cl H₂C 4-TMS-Cp Ind 81d Zr Cl H₂C 3-TMSCp Ind 82d Zr Cl H₂C 4-Ph-Cp Ind 83d Zr Cl H₂C 3-Ph-Cp Ind 84d Zr Cl Me₂C 4-tBu-Cp Ind 85d Zr Cl Me₂C 3-tBu-Cp Ind 86d Zr Cl Me₂C 4-TMS-Cp Ind 87d Zr Cl Me₂C 3-TMSCp Ind 88d Zr Cl Me₂C 4-Ph-Cp Ind 89d Zr Cl Me₂C 3-Ph-Cp Ind 90d Zr Cl Ph₂C 4-tBu-Cp Ind 91d Zr Cl Ph₂C 3-tBu-Cp Ind 92d Zr Cl Ph₂C 4-TMS-Cp Ind 93d Zr Cl Ph₂C 3-TMSCp Ind 94d Zr Cl Ph₂C 4-Ph-Cp Ind 95d Zr Cl Ph₂C 3-Ph-Cp Ind 96d Zr Cl cyclobutylidene 4-tBu-Cp Ind 97d Zr Cl cyclobutylidene 3-tBu-Cp Ind 98d Zr Cl cyclobutylidene 4-TMS-Cp Ind 99d Zr Cl cyclobutylidene 3-TMSCp Ind 100d  Zr Cl cyclobutylidene 4-Ph-Cp Ind 101d  Zr Cl cyclobutylidene 3-Ph-Cp Ind 102d  Zr Cl Et 4-tBu-Cp Ind 103d  Zr Cl Et 3-tBu-Cp Ind 104d  Zr Cl Et 4-TMS-Cp Ind 105d  Zr Cl Et 3-TMSCp Ind 106d  Zr Cl Et 4-Ph-Cp Ind 107d  Zr Cl Et 3-Ph-Cp Ind 108d  Zr Cl Me₂Ge 4-tBu-Cp Ind 109d  Zr Cl Me₂Ge 3-tBu-Cp Ind 110d  Zr Cl Me₂Ge 4-TMS-Cp Ind 111d  Zr Cl Me₂Ge 3-TMSCp Ind 112d  Zr Cl Me₂Ge 4-Ph-Cp Ind 113d  Zr Cl Me₂Ge 3-Ph-Cp Ind 114d  Zr Cl Me₂Si 4-tBu-Cp 3-Me-Ind 115d  Zr Cl Me₂Si 3-tBu-Cp 3-Me-Ind

TABLE d-4 (continued) Ind-3-R^(3d)- No. M^(1d) X^(1d), X^(2d) R^(1d) ₂Q^(1d) Cp-2,3,4,5-R^(2d) ₄ 4,5,6,7-R^(5d) ₄ 116d Zr Cl Me₂Si 4-TMS-Cp 3-Me-Ind 117d Zr Cl Me₂Si 3-TMSCp 3-Me-Ind 118d Zr Cl Me₂Si 4-tBu-Cp 3-iPr-Ind 119d Zr Cl Me₂Si 3-tBu-Cp 3-iPr-Ind 120d Zr Cl Me₂Si 4-TMS-Cp 3-iPr-Ind 121d Zr Cl Me₂Si 3-TMSCp 3-iPr-Ind 122d Zr Cl Me₂Si 4-tBu-Cp 3-tBu-Ind 123d Zr Cl Me₂Si 3-tBu-Cp 3-tBu-Ind 124d Zr Cl Me₂Si 4-TMS-Cp 3-tBu-Ind 125d Zr Cl Me₂Si 3-TMSCp 3-tBu-Ind 126d Zr Cl Me₂Si 4-tBu-Cp 3-TMS-Ind 127d Zr Cl Me₂Si 3-tBu-Cp 3-TMS-Ind 128d Zr Cl Me₂Si 4-TMS-Cp 3-TMS-Ind 129d Zr Cl Me₂Si 3-TMSCp 3-TMS-Ind 130d Zr Cl Me₂Si 4-tBu-Cp 3-Ph-Ind 131d Zr Cl Me₂Si 3-tBu-Cp 3-Ph-Ind 132d Zr Cl Me₂Si 4-TMS-Cp 3-Ph-Ind 133d Zr Cl Me₂Si 3-TMSCp 3-Ph-Ind 134d Zr Cl Me₂C 4-tBu-Cp 3-Me-Ind 135d Zr Cl Me₂C 3-tBu-Cp 3-Me-Ind 136d Zr Cl Me₂C 4-TMS-Cp 3-Me-Ind 137d Zr Cl Me₂C 3-TMSCp 3-Me-Ind 138d Zr Cl Me₂C 4-tBu-Cp 3-iPr-Ind 139d Zr Cl Me₂C 3-tBu-Cp 3-iPr-Ind 140d Zr Cl Me₂C 4-TMS-Cp 3-iPr-Ind 141d Zr Cl Me₂C 3-TMSCp 3-iPr-Ind 142d Zr Cl Me₂C 4-tBu-Cp 3-tBu-Ind 143d Zr Cl Me₂C 3-tBu-Cp 3-tBu-Ind 144d Zr Cl Me₂C 4-TMS-Cp 3-tBu-Ind 145d Zr Cl Me₂C 3-TMSCp 3-tBu-Ind 146d Zr Cl Me₂C 4-tBu-Cp 3-TMS-Ind 147d Zr Cl Me₂C 3-tBu-Cp 3-TMS-Ind 148d Zr Cl Me₂C 4-TMS-Cp 3-TMS-Ind 149d Zr Cl Me₂C 3-TMSCp 3-TMS-Ind 150d Zr Cl Me₂C 4-tBu-Cp 3-Ph-Ind 151d Zr Cl Me₂C 3-tBu-Cp 3-Ph-Ind 152d Zr Cl Me₂C 4-TMS-Cp 3-Ph-Ind 153d Zr Cl Me₂C 3-TMSCp 3-Ph-Ind

The metallocene compound also includes, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Furthermore, in using these metallocene compounds as the essential component (Ad), two or more thereof may be also used.

Among specific compounds exemplified above, preferred metallocene compounds as the essential component (Ad) are described below. The compounds include, for example, 1d-51d, 72d-77d, 84d-89d, 96d-101d, 114d-129d, and 134d-149d in Tables d-1 to d-4.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Among specific compounds exemplified above, more preferred metallocene compounds as the essential component (Ad) are described below. The compounds include, for example, 1d-6d, 17d, 18d, 46d-49d, 115d, 117d, 118d, 121d, 123d, 125d, 127d, 129d, 135d, 137d, 139d, 141d, 143d, 145d, 147d and 149d in Tables d-1 to d-4.

Preferred metallocene compounds also include, for example, compounds where zirconium of the compounds above is replaced by titanium or hafnium.

Furthermore, among specific compounds exemplified above, in terms of high polymerization activity, still more preferred metallocene compounds as the essential component (Ad) are described below. The compounds include, for example, 1d-51, 114d-129d, and 134d to 149d in Tables d-1 to d-4.

In addition, among specific compounds exemplified above, in terms of excellent mobility, still more preferred metallocene compounds as the essential component (Ad) are described below. The compounds include, for example, 1d-6d, 17d, 18d, 46d-49d, 72d-77d, 84d-89d, 96d-101d, 115d, 117d, 119d, 121d, 123d, 125d, 127d, 129d, 135d, 137d, 139d, 141d, 143d, 145d, 147d and 149d in Tables d-1 to d-4.

Synthesis examples for the metallocene compound as the essential component (Ad) according to the present invention are described below, but the present invention is not limited to these synthesis methods in particular.

For example, there are a method where an indene compound is lithioated, then reacted with a dichlorosilane compound and subsequently reacted with a lithium salt of cyclopentadiene having a substituent to obtain a ligand and the obtained ligand is reacted with a tetrakis(alkylamido)zirconium and then with trimethylsilyl chloride, and a method where the obtained ligand is lithioated and subsequently reacted with zirconium tetrachloride.

V-2. Physical Properties (Characteristics) of Olefin-Based Polymer and Ethylene-Based Polymer

By the polymerization method of the present invention, an olefin-based polymer or ethylene-based polymer described below is obtained. Here, physical properties of an ethylene-based polymer are mainly described. In the present invention, an ethylene-based polymer indicates an ethylene homopolymer or an ethylene⋅α-olefin copolymer produced by the above-described copolymerization.

The ethylene-based polymer produced by the production method of an ethylene-based polymer of the present invention satisfies at least the condition (B-4′) out of the conditions defined in the paragraph of Ethylene-Based Polymer of Item [III]. That is, λmax(2.0) of the ethylene-based polymer is from 1.2 to 30.0, preferably from 1.5 to 20.0, more preferably from 2.0 to 10.0, still more preferably from 2.4 to 6.0, yet still more preferably from 3.0 to 5.0. The description of λmax(2.0) that must be satisfied by the ethylene-based polymer is as described above in the paragraph of condition (A-4) or condition (B-4) and is omitted here.

The ethylene-based polymer produced in the present invention is improved in the melting properties as compared with normal ethylene-based polymers and is prominently characterized by having excellent moldability.

In general, a polyethylene is processed into an industrial product by a shaping method involving a molten state, such film molding, blow molding and foam molding, and at this time, it is well known that the elongational flow characteristics greatly affect the ease of molding.

That is, a polyethylene having a narrow molecular weight distribution and having no long-chain branch exhibits bad moldability because of its low melt strength, whereas a polyethylene having an ultrahigh molecular weight component or a long-chain branch component has a property of undergoing strain hardening during melt elongation, that is, abruptly rising in the elongational viscosity on the high strain side, and a polyethylene exhibiting this property outstandingly is said to be excellent in the moldability.

As the method for quantitatively expressing this elongational viscosity property, there is a method where the ratio between the elongational viscosity before strain hardening and the elongational viscosity after strain hardening is calculated as a degree of strain hardening (max), and this is useful as an indicator of non-linearity of the elongational viscosity. When the λmax value is high, this has an effect of preventing uneven wall thickness or blown rupture of a product in the film molding or blow molding, enabling high-speed molding, or making it possible to raise the percentage of closed pores at the foam molding and provides for merits such as increase of strength of a molded article, enhancement of design property, reduction in weight, improvement of molding cycle, and elevation of heat insulating property.

The ethylene-based polymer produced in the present invention has quite characteristic elongational viscosity property, molecular weight distribution and intrinsic viscosity property based on its characteristic long-chain branched structure and furthermore, the ethylene-based polymer produced by the production method of an ethylene-based polymer of the present invention, which satisfies, in addition to the condition (B-4′), preferably at least any one or more, more preferably two or more, still more preferably three or more, yet still more preferably five or more, and most preferably all, of the above-described conditions (B-1′), (B-2″), (B-3). (B-5), (B-7), (B-8) and (B-9), is improved particularly in the melt properties and provided with excellent moldability in comparison to normal ethylene-based polymers and at the same time, is excellent also in the mechanical properties such as stiffness, impact strength and transparency.

EXAMPLES

The present invention is described in greater detail below by referring to Examples and Comparative Examples to demonstrate the excellence of the present invention and the advantage in the configuration of the present invention, but the present invention is not limited to these Examples.

Incidentally, the measurement methods used in Examples and Comparative Examples are as follows. In the following, all of the catalyst synthesizing process and the polymerization process were performed in a purified nitrogen atmosphere, and the solvent employed was dehydrated and purified using molecular sieve 4A and then used.

[Method for Measuring Degree of Strain Hardening of Ethylene-Based Polymer]

The degree of strain hardening (λmax) of elongational viscosity was measured using a Rheometer by the method included in the description of the present invention. Incidentally, in advance of preparation of a test specimen, the dissolution⋅reprecipitation treatment of the polymer was performed according to the following procedure.

Into a 500 ml-volume two-neck flask with a cooling tube, 300 ml of xylene was introduced and after performing nitrogen bubbling at room temperature for 30 minutes, 6.0 g of the polymer and 1.0 g of 2,6-di-tert-butylhydroxytoluene (BTH) were introduced thereinto. In a nitrogen atmosphere, the contents were stirred at 125° C. for 30 minutes to completely dissolve the polymer in xylene, and the xylene solution having dissolved therein the polymer was poured in 2.5 L of ethanol to precipitate the polymer. The polymer was collected by filtration and dried in a vacuum drier at 80° C.

[Measurement of Number of Terminal Double Bonds]

As for the quantitative determination of the terminal double bond, a press film was produced, and after measuring the infrared absorption spectrum (IR) by using an apparatus, FTIR-8300, manufactured by Shimadzu Corporation, the number of terminal double bonds was calculated according to the following formula from the peak absorbance at 910 cm⁻¹. Number of terminal double bonds (bonds/1000 carbons)=1.14×ΔA/d/t wherein ΔA is the peak absorbance at 910 cm⁻¹. [Measurement of Amount of Soluble Matters]

The sample was dissolved in orthodichlorobenzene (containing 0.5 mg/mL BHT) at 140° C. to prepare a solution, and the solution was introduced into a TREF column at 140° C., then cooled to 100° C. at a temperature drop rate of 8° C./min, further cooled to −15° C. at a temperature drop rate of 4° C./min and held for 60 minutes. Thereafter, orthodichlorobenzene (containing 0.5 mg/mL BHT) as a solvent was flowed through the column at a flow velocity of 1 mL/min to elute components dissolved in the orthodichlorobenzene at −15° C. in the TREF column for 10 minutes, and then the column temperature was raised linearly to 140° C. at a temperature rise rate of 100° C./hr to obtain an elution curve.

Apparatus:

(TREF Part)

TREF Column: Stainless steel-made column of 4.3 mmφ×150 mm

Column packing material: Surface-deactivated glass bead of 100 μm

Heating system: Aluminum heating block

Cooling system: Peltier element (cooling of Peltier element was water cooling)

Temperature distribution: ±0.5° C.

Temperature regulator: programmable digital controller, KP 1000, manufactured by Chino Corporation

(Valve Part)

Heating system: Air bath oven

Temperature at measurement: 140° C.

Temperature distribution: ±1° C.

Valve: Six-way valve, four-way valve

(Sample Injection Part)

Injection system: Loop injection system

Injection amount: Loop size, 0.1 ml

Injection port heating system: Aluminum heating block

Temperature at measurement: 140° C.

(Detector Part)

Detector: Wavelength-fixed infrared detector, MIRAN 1A, manufactured by FOXBORO

Detection wavelength: 3.42 μm

High-temperature flow cell: Micro-flow cell for LC-IR, optical path length: 1.5 mm, window shape: oval of 2φ×4 mm, synthetic sapphire aperture plate

Temperature at measurement: 140° C.

(Pump Part)

Liquid delivery pump: SSC-3461 pump, manufactured by Senshu Kagaku

Measurement Conditions:

Solvent: o-Dichlorobenzene (containing 0.5 mg/mL of BHT)

Sample concentration: 5 mg/mL

Sample injection amount: 0.1 mL

Solvent flow velocity: 1 mL/min

[Evaluation Method of Film]

(1) Tensile Modulus

The tensile modulus at a deformation of 1% in the film processing direction (MD direction) and the film width direction (TD direction) was measured in accordance with JIS K7127-1999.

(2) Film Impact

A film-shaped test specimen was fixed on a holder having a diameter of 50 mm and struck with a perforator having a specified tip diameter (a hemispherical type of 25.4 mmφ), and the energy (J/mm) required for perforation into fracture was measured. A higher value indicates that the impact strength is excellent.

A tester having a 90° arcuate arm capable of attaching a perforator to the distal end was used in accordance with JS P8134.

(3) Transparency (Haze)

The transparency was measured in accordance with JIS K7105-1981. A smaller value indicates that the transparency is excellent.

(4) Tear Strength (Elmendorf Tearing Method)

The tear strength (N/mm) in the film processing direction (MD direction) and the film width direction (TD direction) was measured in accordance with JIS K7128-1991.

[Molding Conditions of Inflation Film and Evaluation Method of Moldability]

At the time of molding a film of 30 μm, an inflation film was molded under the following molding conditions by using the following inflation film forming machine (molding apparatus) with an extruder of 30 mmφ, and evaluated.

Apparatus: Inflation molding apparatus

Screw diameter of extruder: 30 mmφ

Die diameter: 25 mmφ

Extrusion amount: 10 kg/hr

Lip gap of die: 2.0 mm

Taking-up speed: 6.0 m/min

Blow-up ratio: 2.0

Molding resin temperature: from 170 to 190° C. (shown in Examples)

Film thickness: 30 μm

Cooling ring: Single-slit air ring

At the time of molding a film of 50 μm, an inflation film was molded under the following molding conditions by using the following inflation film forming machine (molding apparatus) with an extruder of 50 mmφ0, and evaluated.

Apparatus: Inflation molding apparatus

Screw diameter of extruder: 50 mmφ

Die diameter: 75 mmφ

Extrusion amount: 20 kg/hr

Lip gap of die: 3.0 mm

Taking-up speed: 15 m/min

Blow-up ratio: 2.0

Molding resin temperature: from 170 to 190° C.

Film thickness: 50 μm

Cooling ring: Two-stage air-cooling ring

Example 1a(a)

(1) Production of Ethylene-Based Polymer (A-1)

[Preparation of Metallocene Catalyst A-1]

In a catalyst preparation apparatus equipped with an electromagnetic induction stirrer, under a nitrogen flow, 1,000 ml of purified toluene, 22 g of tetraethoxyzirconium (Zr(OEt)₄), 75 g of indene and 88 g of methylbutylcyclopentadiene were added and while keeping the system at 90° C., 100 g of tripropylaluminum was added dropwise over 100 minutes and then reacted at the same temperature for 2 hours. The reaction product was cooled to 40° C. and thereafter, 3,200 ml of a toluene solution of methylalumoxane (concentration: 2.5 mmol/ml) was added. After stirring for 2 hours, 2,000 g of silica (#952, produced by Grace, surface area: 300 m²/g) previously subjected to a calcining treatment at 450° C. for 5 hours was added and stirred at room temperature for 1 hour. Thereafter, nitrogen blow at 40° C. and reduced-pressure drying were performed to obtain Solid Catalyst A-1 having good flowability.

[Production of Ethylene⋅1-Hexene Copolymer]

In a continuous gas-phase polymerization apparatus (inner volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.5 kg) set such that the molar ratio of 1-hexene/ethylene is 0.018, the molar ratio of hydrogen/ethylene is 2.9×10⁻⁴, the nitrogen concentration is 30 mol %, the total pressure is 0.8 MPa and the temperature is 80° C., a hexane solution (0.03 mmol/ml) of triethylaluminum was fed at 7 ml/h and while keeping the gas composition and the temperature constant, polymerization was performed by intermittently feeding Solid Catalyst A-1 to achieve a production yield of about 320 g per hour. The activity was 420 g/(g of catalyst·MPa·h). When physical properties of the obtained Ethylene-Based Polymer (A-1) were measured, MFR was 2.0 g/10 min and the density was 0.918 g/cm³.

(2) Production of Ethylene-Based Polymer (B-1)

[Preparation of Metallocene Catalyst B-1]

Dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride was synthesized using cyclopentadienyl-(3-methylindenyl)dimethylsilane according to the procedure described in Macromolecules 1995, 28, 3771-3778.

In a nitrogen atmosphere, 5 g of silica calcined at 600° C. for 5 hours was put in a 200-ml two-neck flask and dried at reduced pressure with a vacuum pump for 1 hour while heating the flask in an oil bath at 150° C. In a nitrogen atmosphere, 51.8 mg of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride synthesized above was put in a separately prepared 100-ml two-neck flask and dissolved in 13.4 ml of dehydrated toluene, and thereafter, 8.6 ml of a 20% methylaluminoxane/toluene solution produced by Albemarle was further added at room temperature and stirred for 30 minutes. While heating the 200-ml two-neck flask containing vacuum-dried silica in an oil bath at 40° C. and stirring the contents, the entire amount of the toluene solution above containing a reaction product of the complex and methylaluminoxane was added and stirred at 40° C. for 1 hour. While heating the system at 40° C., the toluene solvent was removed by distillation under reduced pressure to obtain Solid Catalyst B-1.

[Production of Ethylene⋅1-Hexene Copolymer]

Continuous gas-phase copolymerization of Ethylene⋅1-hexene was performed using Solid Catalyst B-1. That is, in a continuous gas-phase polymerization apparatus (inner volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.8 kg) set such that the temperature is 75° C., the molar ratio of hexene/ethylene is 0.012, the molar ratio of hydrogen/ethylene is 1.5×10⁻³, the nitrogen concentration is 24 mol % and the total pressure is 0.8 MPa, polymerization was performed by keeping the gas composition and the temperature constant while intermittently feeding the solid catalyst at a rate of 0.38 g/hour. Also, in order to maintain the cleanliness in the system, 0.03 mol/L of a triethylahuninum (TEA) solution diluted with hexane was fed at 7 ml/hr to a gas circulating line. As a result, the average production rate of the product polyethylene became 420 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-1) were 0.8 g/10 min and 0.914 g/cm³, respectively.

(3) Production of Polyethylene-Based Resin Composition 1a

A polyethylene resin at a mixing ratio of 95 wt % of Ethylene-Based Polymer (A-1) and 5 wt % of Ethylene-Based Polymer (B-1) was mixed and homogenized by a mixer.

The obtained mixture was melt-kneaded by a twin-screw extruder, and the extrudate was solidified and granulated. With respect to the finally obtained Granular Polyethylene Resin Composition 1a, film moldability and film physical properties were evaluated by the above-described method of molding a 50μ film. The results obtained are shown in Table 1a-1 and Table 1a-2.

Example 1a(b)

Production of Polyethylene-Based Resin Composition 1b and film molding were performed in the same manner as in (1) to (3) of Example 1a(a) except that the mixing ratio of ethylene-based polymers was changed to 90 wt % of Ethylene-Based Polymer (A-1) and 10 wt % of Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Example 1a(c)

Production of Polyethylene-Based Resin Composition 1c and film molding were performed in the same manner as in (1) to (3) of Example 1a(a) except that the mixing ratio of ethylene-based polymers was changed to 80 wt % of Ethylene-Based Polymer (A-1) and 20 wt % of Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Comparative Example C1a(a)

Production of Polyethylene-Based Resin Composition C1a and film molding were performed in the same manner as in Example 1a(c) except that in Example 1a(c), a high-pressure radical process low-density polyethylene (LF240, produced by Japan Polyethylene Corporation; MFR=0.7 g/10 min, density: 0.924 g/cm³) was used in place of Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Comparative Example C1a(b)

Production of Polyethylene-Based Resin Composition C1b and film molding were performed in the same manner as in Example 1a(c) except that in Example 1a(c), a commercially available ethylene-based polymer having a long-chain branch (CB2001, produced by Sumitomo Chemical Co., Ltd.; MFR=1.8 g/10 min, density: 0.918 g/cm³) was used in place of Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Comparative Example C1a(c)

Production of Polyethylene-Based Resin Composition C1c and film molding were performed in the same manner as in (3) of Example 1a(a) except that in Example 1a(a), Ethylene-Based Polymer (A-1) was used alone without using Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Example 2a

Production of Polyethylene-Based Resin Composition 2 and film molding were performed in the same manner as in Example 1a(c) except that in Example 1a(c), a commercially available Ethylene-Based Polymer (A-2) produced using Magnesiumn⋅Titanium Composite Ziegler Catalyst (A-2) (UF230, produced by Japan Polyethylene Corporation: MFR=1.0 g/10 min, density: 0.921 g/cm³, ethylene⋅1-butene copolymer) was used in place of Ethylene-Based Polymer (A-1) produced by a metallocene catalyst. The results obtained are shown in Table 1a-1 and Table 1a-2.

Comparative Example 2a

Production of Polyethylene-Based Resin Composition C2 and film molding were performed in the same manner except that in Example 2a, Ethylene-Based Polymer (A-2) was used alone without using Ethylene-Based Polymer (B-1). The results obtained are shown in Table 1a-1 and Table 1a-2.

Example 3a(a)

(1) Production of Ethylene-Based Polymer (B-3)

[Preparation of Metallocene Catalyst B-3]

Solid Catalyst B-3 was obtained in the same manner as in (2) of Example 1a(a) except that as the metallocene complex, 46.6 mg of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride and 5.6 mg of rac-dimethylsilylenebis(indenyl)zirconium dichloride (produced by Wako Pure Chemical Industries, Ltd.) were used in place of 51.8 mg of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride.

[Production of Ethylene⋅1-Hexene Copolymer]

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (2) of Example 1a(a) by using Solid Catalyst B-3. That is, in a continuous gas-phase polymerization apparatus (inner volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.8 kg) set such that the temperature is 75° C., the molar ratio of hexene/ethylene is 0.007, the molar ratio of hydrogen/ethylene is 2.5×10⁻³, the nitrogen concentration is 20 mol % and the total pressure is 0.8 MPa, polymerization was performed by keeping the gas composition and the temperature constant while intermittently feeding the solid catalyst at a rate of 0.18 g/hour. Also, in order to maintain the cleanliness in the system. 0.03 mol/L of a triethylaluminum (TEA) solution diluted with hexane was fed at 7 ml/hr to a gas circulating line. As a result, the average production rate of the product polyethylene became 300 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-3) were 0.3 g/10 min and 0.921 g/cm³, respectively.

(2) Production of Polyethylene-Based Resin Composition 3a

A polyethylene resin composed of 90 wt % of Ethylene-Based Polymer (A-1) produced in (1) of Example 1a(a) and 10 wt % of Ethylene-Based Polymer (B-3) obtained in (1) above was mixed and homogenized by a mixer.

The obtained mixture was melt-kneaded by a twin-screw extruder, and the extrudate was solidified and granulated. With respect to the finally obtained Granular Polyethylene Resin Composition 3a, film moldability and film physical properties were evaluated by the above-described method of molding a 30μ film. The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 4a(a)

(1) Production of Ethylene-Based Polymer (B-4)

[Preparation of Metallocene Catalyst B-4]

Solid Catalyst B-4 was obtained in the same manner as in (2) of Example 1a(a) except that 52.5 mg of rac-ethylenebisindenylzirconium dichloride (produced by Strem Chemicals, Inc.) was used as the metallocene complex in place of 51.8 mg of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride and reacted with methylaminoxane in a toluene solvent for 30 minutes in the same manner as in (2) of Example 1a(a) and was further reacted for 30 minutes by adding 10 ml of a separately prepared dehydrated toluene solution containing 201 mg of N,N-dimethylanilinium tetrakispentafluorophenylborate and thereafter, the catalyst was supported on silica.

[Production of Ethylene⋅1-Hexene Copolymer]

An ethylene⋅1-hexene copolymer was produced using Solid Catalyst B-4. That is, 800 mL of isobutane, 22 mL of 1-hexene and 0.20 mmol of triethylaluminum were added to a 2 L-volume autoclave with an induction stirring device, the temperature was raised to 75° C., 130 mL of H₂ was added, and the ethylene partial pressure was kept at 1.4 MPa by further introducing ethylene. Subsequently, 54 mg of Solid Catalyst B-4 was injected with nitrogen and after continuing the polymerization for 120 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C., the polymerization was stopped by adding ethanol. Incidentally, during the polymerization reaction, additional feeding of H2 and 1-hexene was performed at feed rates proportional to the ethylene consumption rate. As a result, the molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and at the completion of polymerization was 0.21% and 0.35%, respectively, and the amount of 1-hexene additionally fed was 28 mL. The amount of the thus-obtained Ethylene Polymer (B-4) was 205 g, and the MFR and density thereof were 0.3 g/0 min and 0.923 g/cm³, respectively.

(2) Production of Polyethylene-Based Resin Composition 4a

Polyethylene-Based Resin Composition 4a was produced and evaluated for film moldability and film physical properties in the same manner as in (2) of Example 3a(a) except for using Ethylene-Based Polymer (B-4) in place of Ethylene-Based Polymer (B-3). The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 5a(a)

(1) Production of Ethylene-Based Polymer (B-5)

[Preparation of Metallocene Catalyst B-5]

In a nitrogen atmosphere, 10 g of silica calcined at 600° C. for 5 hours was put in a 200-ml two-neck flask and dried at reduced pressure with a vacuum pump for 1 hour while heating the flask in an oil bath at 150° C. In a nitrogen atmosphere, 46 mg (0.1 mmol) of trisindenylzirconium hydride and 118 mg (0.2 mmol) of trisbenzindenylzirconium hydride were put in a separately prepared 100-ml two-neck flask and dissolved in 20 ml of dehydrated toluene, and thereafter, 14.0 ml of a 20% methylaluminoxane/toluene solution produced by Albemarle was further added at room temperature and stirred for 30 minutes. While heating the 200-ml two-neck flask containing vacuum-dried silica in an oil bath at 40° C. and stirring the contents, the entire amount of the toluene solution above containing a reaction product of those two complexes and methylaluminoxane was added and stirred at 40° C. for 1 hour. While heating the system at 40° C., the toluene solvent was removed by distillation under reduced pressure to obtain Solid Catalyst B-5.

[Production of Ethylene⋅1-Hexene Copolymer]

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (2) of Example 1a(a) by using Solid Catalyst B-5. That is, in a continuous gas-phase polymerization apparatus (inner volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.8 kg) set such that the temperature is 80° C., the molar ratio of hexene/ethylene is 0.020, the molar ratio of hydrogen/ethylene is 4.7×10⁻⁴, the nitrogen concentration is 26 mol % and the total pressure is 0.8 MPa, polymerization was performed by keeping the gas composition and the temperature constant while intermittently feeding the solid catalyst at a rate of 0.19 g/hour. Also, in order to maintain the cleanliness in the system, 0.03 mol/L of a triethylaluminum (TEA) solution diluted with hexane was fed at 7 ml/hr to a gas circulating line. As a result, the average production rate of the product polyethylene became 260 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-5) were 0.3 g/10 min and 0.922 g/cm, respectively.

(2) Production of Polyethylene-Based Resin Composition 5a

Polyethylene-Based Resin Composition 5a was produced and evaluated for film moldability and film physical properties in the same manner as in (2) of Example 3a(a) except for using Ethylene-Based Polymer (B-5) in place of Ethylene-Based Polymer (B-3). The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C3a(a)

Production of Polyethylene-Based Resin Composition C3a and evaluation of film moldability and film physical properties were performed in the same manner as in Example 3a(2) except that a high-pressure radical process low-density polyethylene (LF240, produced by Japan Polyethylene Corporation) was used in place of Ethylene-Based Polymer (B-3). The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C4a(a)

Production of Ethylene-based Polymer (B-C4) and Polyethylene-Based Resin Composition C4a and evaluation of film moldability and film physical properties were performed in the same manner as in Example 4a(a) except that in (1) of Example 4a(a), N,N-dimethylanilinium tetrakispentafluorophenylborate was not used. The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C5a

Production of Polyethylene-Based Resin Composition C5 and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 3a(a) except that in Example 3a(a), Ethylene-Based Polymer (A-1) was used alone without using Ethylene-Based Polymer (B-3). The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C6a

Production of Polyethylene-Based Resin Composition C6 and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 3a(a) except that in Example 5a(a), Ethylene-Based Polymer (B-5) was used alone without using Ethylene-Based Polymer (A-1). The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 3a(b)

Production of Polyethylene-Based Resin Composition 3b and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 3a(a) except that in (2) of Example 3a(a), the mixing ratio of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-3) was changed to 80 wt %:20 wt %. The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 4a(b)

Production of Polyethylene-Based Resin Composition 4b and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 4a(a) except that in (2) of Example 4a(a), the mixing ratio of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-4) was changed to 80 wt %:20 wt %. The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 5a(b)

Production of Polyethylene-Based Resin Composition 5b and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 5a(a) except that in (2) of Example 5a(a), the mixing ratio of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-5) was changed to 80 wt %:20 wt %. The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C3a(b)

Production of Polyethylene-Based Resin Composition C3b and evaluation of film moldability and film physical properties were performed in the same manner except that in Comparative Example C3a(a), the mixing ratio of Ethylene-Based Polymer (A-1) and high-pressure radical process low-density polyethylene was changed to 80 wt %:20 wt %. The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C7a

Production of Polyethylene-Based Resin Composition C7 and evaluation of film moldability and film physical properties were performed in the same manner as in Comparative Example C5a except that Ethylene-Based Polymer (A-3) produced in the same manner as in (1) of Example 1a(a) except for setting the molar ratio of hexene/ethylene to 0.017 and setting the molar ratio of hydrogen/ethylene to 2.1×10⁻⁴ was used in place of Ethylene-Based Polymer (A-1). The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 5a(c)

Production of Polyethylene-Based Resin Composition 5c and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 5a(a) except that in (2) of Example 5a(a), the mixing ratio of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-5) was changed to 70 wt %:30 wt %. The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C8a

(1) Production of Ethylene-Based Polymer (A-4)

Ethylene-Based Polymer (A-4) was produced in the same manner as in (1) of Example 1a(a) except that the molar ratio of hexene/ethylene was set to 0.011 and the molar ratio of hydrogen/ethylene was set to 3.4×10⁻⁴.

(2) Production of Ethylene-Based Polymer (B-C8)

[Preparation of Metallocene Catalyst B-C8]

Solid Catalyst B-C8 was prepared in the same manner as in preparation of Metallocene Catalyst B-1 in (2) of Example 1a(a) except that 95.6 mg of dimethylsilylenebis[4-phenyl-2-(2-furyl)-indenyl]zirconium dichloride was used in place of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride. Incidentally, dimethylsilylenebis[4-phenyl-2-(2-furyl)-indenyl]zirconium dichloride was synthesized according to the procedure described in JP-T-2002-535339.

[Production of Ethylene⋅1-Hexene Copolymer]

An ethylene⋅1-hexene copolymer was produced using Solid Catalyst B-C8. That is. 800 mL of isobutane, 30 mL of 1-hexene and 2 mmol of triethylaluminum were added to a 2 L-volume autoclave with an induction stirring device, the temperature was raised to 75° C., 95 mL of H₂ was added, and the ethylene partial pressure was kept at 1.4 MPa by further introducing ethylene. Subsequently, 27 mg of Solid Catalyst B-C8 was injected with nitrogen and after continuing the polymerization for 90 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C., the polymerization was stopped by adding ethanol. Incidentally, during the polymerization reaction, additional feeding of H2 and 1-hexene was performed at feed rates proportional to the ethylene consumption rate. As a result, the molar ratio of H2/C2 (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and at the completion of polymerization was 0.15% and 0.14%, respectively, and the amount of 1-hexene additionally fed was 19 mL. The amount of the thus-obtained Ethylene Polymer (B-C8) was 113 g. and the MFR and density thereof were 0.05 g/10 min and 0.894 g/cm³, respectively.

(3) Production of Polyethylene-Based Resin Composition C8

Polyethylene-Based Resin Composition C8 was produced and evaluated for film moldability and film physical properties in the same manner as in Example 5a(c) except that Ethylene-Based Polymer (A-4) was used in place of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-C8) was used in place of Ethylene-Based Polymer (B-5). The results obtained are shown in Table 2a-1 and Table 2a-2.

Comparative Example C9a

(1) Production of Ethylene-Based Polymer (A-4)

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (2) of Example 1a(a) using Solid Catalyst B-5. That is, in a continuous gas-phase polymerization apparatus (inner volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.8 kg) set such that the temperature is 85° C., the molar ratio of hexene/ethylene is 0.016, the molar ratio of hydrogen/ethylene is 6.2×10⁻⁴, the nitrogen concentration is 30 mol % and the total pressure is 0.8 MPa, polymerization was performed by keeping the gas composition and the temperature constant while intermittently feeding the solid catalyst at a rate of 0.36 g/hour. Also, in order to maintain the cleanliness in the system, 0.03 mol/L of a triethylaluminum (TEA) solution diluted with hexane was fed at 7 ml/hr to a gas circulating line. As a result, the average production rate of the product polyethylene became 400 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-5) were 5.9 g/10 min and 0.927 g/cm³, respectively.

(2) Production of Polyethylene-Based Resin Composition C9

Polyethylene-Based Resin Composition C9 was produced and evaluated for film moldability and film physical properties in the same manner as in Example 5a(c) except that Ethylene-Based Polymer (A-5) was used in place of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-C8) produced in (2) of Comparative Example C8a was used in place of Ethylene-Based Polymer (B-5). The results obtained are shown in Table 2a-1 and Table 2a-2.

Example 6a(a)

(1) Production of Ethylene-Based Polymer (A-6)

Ethylene-Based Polymer (A-6) was produced in the same manner as in (1) of Example 1a(a) except that the molar ratio of 1-hexene/ethylene was set to 0.011 and the molar ratio of hydrogen/ethylene was set to 2.7×10⁻⁴.

(2) Production of Ethylene-Based Polymer (B-6)

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (1) of Example 5a(a). However, the temperature was 65° C., the molar ratio of hexene/ethylene was 0.025, the molar ratio of hydrogen/ethylene was 9.3×10⁻⁴, the nitrogen concentration was 24 mol % and the total pressure was 0.8 MPa. As a result, the average production rate of the product polyethylene became 290 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-6) were 0.3 g/10 min and 0.906 g/cm³, respectively.

(3) Production of Polyethylene-Based Resin Composition 6

Production of Polyethylene-Based Resin Composition 6 and evaluation of film moldability and film physical properties were performed in the same manner as in Example 5a(c) except that Ethylene-Based Polymer (A-6) and Ethylene-Based Polymer (B-6) were used in place of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-5), respectively. The results obtained are shown in Table 3a-1 and Table 3a-2.

Comparative Example C10a(a)

Production of Polyethylene-Based Resin Composition C10 and evaluation of film moldability and film physical properties were performed in the same manner as in Comparative Example C5a except that Ethylene-Based Polymer (A-7) produced in the same manner as in (1) of Example 1a(a) except for setting the molar ratio of 1-hexene/ethylene to 0.013 and setting the molar ratio of hydrogen/ethylene to 2.3×10⁻⁴ was used in place of Ethylene-Based Polymer (A-1). The results obtained are shown in Table 3a-1 and Table 3a-2.

Example 7a(a)

(1) Production of Ethylene-Based Polymer (A-7)

Ethylene-Based Polymer (A-7) produced by continuous gas-phase polymerization using Magnesiumn.Titanium Composite Ziegler Catalyst (A-2) (MFR=1.5 g/10 min, density: 0.936 g/cm³, ethylene⋅1-butene copolymer) was used.

(2) Production of Polyethylene-Based Resin Composition 7

Production of Polyethylene-Based Resin Composition 7 and evaluation of film moldability and film physical properties were performed in the same manner as in Example 3a(a) except that Ethylene-Based Polymer (A-7) and Ethylene-Based Polymer (B-6) were used in place of Ethylene-Based Polymer (A-1) and Ethylene-Based Polymer (B-3), respectively. The results obtained are shown in Table 3a-1 and Table 3a-2.

Comparative Example C11a(a)

Production of Polyethylene-Based Resin Composition C11 and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 7a(a) except that in Example 7a(a), the same high-pressure radical process low-density polyethylene as in Comparative Example C1a(a) was used in place of Ethylene-Based Polymer (B-6) and the mixing proportions of Ethylene-Based Polymer (A-7) and the high-pressure radical process low-density polyethylene were set to 80 wt % and 20 wt %. The results obtained are shown in Table 3a-1 and Table 3a-2.

Comparative Example C12a(a)

(1) Production of Ethylene-Based Polymer (B-C9)

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (1) of Example 1a(a). However, the temperature was 65° C., the molar ratio of hexene/ethylene was 0.025 and the molar ratio of hydrogen/ethylene was 2.6×10⁻⁴. As a result, the average production rate of the product polyethylene became 320 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained ethylene-based polymer were 1.0 g/10 min and 0.906 g/cm³, respectively.

(2) Production of Polyethylene-Based Resin Composition C12

Production of Polyethylene-Based Resin Composition C12 was performed in the same manner as in (2) of Example 7a(a) except that in Example C11a(a), a mixture of Ethylene-Based Polymer (B-C9) and a high-pressure radical process low-density polyethylene (produced by Japan Polyethylene Corporation; MFR=0.8 g/10 min, density: 0.924 g/cm³) (mixing ratio: 66 wt %:34 wt %) was used in place of Ethylene-Based Polymer (B-7) and the mixing proportions of Ethylene-Based Polymer (A-7) and the mixture were set to 62 wt % and 38 wt %.

That is, three components of Ethylene-Based Polymer (A-7), Ethylene-Based Polymer (B-C9) and the high-pressure radical process low-density polyethylene were mixed and homogenized by a mixer, and the obtained mixture was melt-kneaded by a twin-screw extruder. The extrudate was solidified and granulated, and with respect to the finally obtained Granular Polyethylene Resin Composition C12, film moldability and film physical properties were evaluated by the above-described method of molding a 30μ film. The results obtained are shown in Table 3a-1 and Table 3a-2.

Comparative Example C13a(a)

Production of Polyethylene-Based Resin Composition C13 and evaluation of film moldability and film physical properties were performed in the same manner as in (2) of Example 7a(a) except that in Example C11a(a), Ethylene-Based Polymer (A-2) of Example 2a was used in place of Ethylene-Based Polymer (A-7) and the mixing proportions of Ethylene-Based Polymer (A-2) and the high-pressure radical process low-density polyethylene were set to 90 wt % and 10 wt %. The results obtained are shown in Table 3a-1 and Table 3a-2.

Example 8a

(1) Production of Ethylene-Based Polymer (B-8)

[Preparation of Metallocene Catalyst B-8]

Solid Catalyst B-8 was obtained in the same manner as in (2) of Example 1a(a) except that 68.7 mg of dimethylsilylene(cyclopentadienyl)[4-(4-trimethylsilylphenyl)indenyl]zirconium dichloride was used as the metallocene complex in place of 51.8 mg of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride.

[Production of Ethylene⋅1-Hexene Copolymer]

Continuous gas-phase copolymerization of ethylene⋅1-hexene was performed in the same manner as in (2) of Example 1a(a) using Solid Catalyst B-8. That is, in a continuous gas-phase polymerization apparatus (internal volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.8 kg) which is set such that the temperature is 75° C., the molar ratio of hexene/ethylene is 0.004, the molar ratio of hydrogen/ethylene is 5.5×10⁻³, the nitrogen concentration is 20 mol % and the total pressure is 0.8 MPa, polymerization was performed by keeping the gas composition and the temperature constant while intermittently feeding the solid catalyst at a rate of 0.57 g/hour. Also, in order to maintain the cleanliness in the system, 0.03 mol/L of a triethylaluminum (TEA) solution diluted with hexane was fed at 12 ml/hr to a gas circulating line. As a result, the average production rate of the product polyethylene became 288 g/hour. After producing a polyethylene in a cumulative amount of 5 kg or more, the MFR and density of the obtained Ethylene-Based Polymer (B-8) were 0.2 g/10 min and 0.920 g/cm³, respectively.

(2) Production of Polyethylene-Based Resin Composition 8a

A polyethylene resin composed of 80 wt % of a commercially available Ethylene-Based Polymer (A-2) produced using Magnesium.Titanium Composite Ziegler Catalyst (A-2) (UF230, produced by Japan Polyethylene Corporation: MFR=1.0 g/10 min, density: 0.921 g/cm³, ethylene 1-butene copolymer) and 20 wt % of Ethylene-Based Polymer (B-8) obtained in (1) above was mixed and homogenized by a mixer.

The obtained mixture was melt-kneaded by a twin-screw extruder, and the extrudate was solidified and granulated. With respect to the finally obtained Granular Polyethylene Resin Composition 8a, film moldability and film physical properties were evaluated by the above-described method of molding a 50μ film. The results obtained are shown in Table 4a-1 and Table 4a-2.

Comparative Example 9a

Production of a polyethylene resin composition and evaluation of film molding were performed in the same manner as in Example 8a(2) except that 90 wt % of the commercially available Ethylene-Based Polymer (A-2) and 10 wt % of Ethylene-Based Polymer (B-8) were used.

Comparative Example C14a

Production of Polyethylene-Based Resin Composition C14a and film molding were performed in the same manner as in Example 8a except that in Example 9a, a high-pressure radical process low-density polyethylene (LF240, produced by Japan Polyethylene Corporation; MFR=0.7 g/10 min, density: 0.924 g/cm³) was used in place of Ethylene-Based Polymer (B-8). The results obtained are shown in Table 4a-1 and Table 4a-2.

Comparative Example C15a

Production of Polyethylene-Based Resin Composition C15a and film molding were performed in the same manner as in Example 8a except that in Example 9a, a commercially available ethylene-based polymer having a long-chain branch (CU5001, produced by Sumitomo Chemical Co., Ltd.; MFR=0.3 g/10 min, density: 0.922 g/cm³) was used in place of Ethylene-Based Polymer (B-8). The results obtained are shown in Table 4a-1 and Table 4a-2.

TABLE 1a-1 Ethylene-Based Polymer (A) Ethylene-Based Polymer (B) Kind of Kind of λ_(max) Content Polymer- Den- Polymer- Den- (2.0)/ of ization MFR_(A) sity_(A) [Mw/ λ_(max) ization MFR_(B) sity_(B) [Mw/ λ_(max) λ_(max) λ_(max) g′ MW ≥10{circumflex over ( )}6 Catalyst g/10 min g/cm³ Mn]_(A) (2.0) Catalyst g/10 min g/cm³ Mn]_(B) (2.0) (0.1) (0.1) Value % Example metal- 2.0 0.918 3.0 1.0 metal- 0.8 0.914 3.4 3.1 1.7 1.8 0.46 0.10 1a (a) locene locene Example 1a (b) Example 1a (c) Compar- high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pres- Example sure PE C1a (a) Compar- metal- 1.8 0.918 6.0 2.6 2.3 1.1 0.51 0.00 ative locene Example C1a (b) Compar- — — — — — — — — — ative Example C1a (c) Example Ziegler 1.0 0.921 3.8 1.0 metal- 0.8 0.914 3.4 3.1 1.7 1.8 0.46 0.10 2a locene Compar- — — — — — — — — — ative Example 2a

TABLE 1a-2 Polyethylene-Based Film Physical Properties Resin Composition 1% Tensile Film Tear Tear Compositional Molding Resin Film Modulus in Impact Strength in Strength in Ratio Den- Temper- Pres- Thick- MD Direction Strength MD Direction TD Direction (A)/(A) + (B) MFR sity ature sure ness (X) (Y) Haze (Z_(MD)) (Z_(TD)) Z_(MD)/ wt % g/10 min g/cm³ ° C. MPa μm MPa J/mm % N/mm N/mm Z_(TD) Example 95 1.9 0.918 170 13.0 50 224 16.0 7.7 121 200 0.61 1a (a) Example 90 1.7 0.918 13.0 211 15.6 6.5 87 219 0.40 1a (b) Example 80 1.5 0.917 12.9 204 13.7 4.8 56 221 0.25 1a (c) Compar- 1.5 0.919 13.5 223 10.0 4.4 35 236 0.15 ative Example C1a (a) Compar- 1.9 0.918 12.2 226 5.6 6.6 76 226 0.34 ative Example C1a (b) Compar- 100 2.0 0.918 13.0 204 16.9 17.9 128 192 0.67 ative Example C1a (c) Example 80 1.0 0.920 190 14.0 50 236 19.2 6.1 21 165 0.13 2a Compar- 100 1.0 0.921 15.0 246 15.7 14.9 35 153 0.23 ative Example 2a

TABLE 2a-1 Ethylene-Based Polymer (A) Ethylene-Based Polymer (B) Kind of Kind of λ_(max) Content Polymer- Den- Polymer- Den- (2.0)/ of ization MFR_(A) sity_(A) [Mw/ λ_(max) ization MFR_(B) sity_(B) [Mw/ λ_(max) λ_(max) λ_(max) g′ MW ≥10{circumflex over ( )}6 Catalyst g/10 min g/cm³ Mn]_(A) (2.0) Catalyst g/10 min g/cm³ Mn]_(B) (2.0) (0.1) (0.1) Value % Example metal- 2.0 0.918 3.0 1.0 metal- 0.3 0.921 3.5 2.5 2.0 1.3 0.44 0.02 3a (a) locene locene Example metal- 0.3 0.923 5.1 2.0 1.6 1.3 0.46 0.46 4a (a) locene Example metal- 0.3 0.922 3.9 1.2 1.0 1.2 0.60 1.34 5a (a) locene Compar- high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pres- Example sure PE C3a (a) Compar- metal- 0.5 0.925 6.1 5.0 4.6 1.1 0.49 2.19 ative locene Example C4a (a) Compar- — — — — — — — — — ative Example C5a Compar- — — — — — metal- 0.3 0.922 3.9 2.3 1.6 1.4 0.60 1.34 ative locene Example C6a Example metal- 2.0 0.918 3.0 1.0 metal- 0.3 0.921 3.5 2.5 2.0 1.3 0.44 0.02 3a (b) locene locene Example metal- 0.3 0.923 5.1 2.0 1.6 1.3 0.46 0.46 4a (b) locene Example metal- 0.3 0.922 3.9 1.2 1.0 1.2 0.60 1.34 5a (b) locene Compar- high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pres- Example sure PE C3a (b) Compar- 1.0 0.920 2.9 1.0 — — — — — — — — — ative Example C7a Example metal- 2.0 0.918 3.0 1.0 metal- 0.3 0.922 3.9 1.2 1.0 1.2 0.60 1.34 5a (c) locene locene Compar- metal- 4.5 0.931 2.5 1.0 metal-  0.05 0.894 3.3 1.0 1.0 1.0 0.91 0.29 ative locene locene Example C8a (a) Compar- metal- 5.9 0.927 2.7 2.2 ative locene Example C9a (a)

TABLE 2a-2 Polyethylene-Based Film Physical Properties Resin Composition 1% Tensile Film Tear Tear Compositional Molding Resin Film Modulus in Impact Strength in Strength in Ratio Den- Temper- Pres- Thick- MD Direction Strength MD Direction TD Direction (A)/(A) + (B) MFR sity ature sure ness (X) (Y) Haze (Z_(MD)) (Z_(TD)) Z_(MD)/ wt % g/10 min g/cm³ ° C. MPa μm MPa J/mm % N/mm N/mm Z_(TD) Example 90 1.2 0.918 170 13.0 30 231 20.6 7.1 120 194 0.62 3a (a) Example 1.3 0.919 11.5 237 15.4 7.8 95 198 0.48 4a (a) Example 1.3 0.918 11.9 232 16.0 7.9 74 178 0.42 5a (a) Compar- 1.5 0.919 11.8 236 14.4 4.7 92 202 0.46 ative Example C3a (a) Compar- 1.4 0.920 12.0 244 17.6 10.0 112 186 0.60 ative Example C4a (a) Compar- 100 2.0 0.918 11.8 235 28.0 42.8 146 170 0.86 ative Example C5a Compar- 0 0.3 0.922 12.7 248 11.8 56.7 25 72 0.35 ative Example C6a Example 80 1.0 0.920 170 13.0 30 234 17.1 8.4 89 197 0.45 3a (b) Example 1.1 0.922 11.0 250 13.0 6.7 83 207 0.40 4a (b) Example 1.1 0.921 12.0 240 12.1 13.5 72 166 0.43 5a (b) Compar- 1.5 0.920 12.1 240 9.3 4.7 35 283 0.12 ative Example C3a (b) Compar- 100 1.0 0.920 20.5 231 75.8 38.2 124 142 0.87 ative Example C7a Example 70 0.7 0.922 170 12.2 30 259 25.9 14.7 67 146 0.46 5a (c) Compar- 0.7 0.920 17.8 241 28.9 14.6 82 184 0.45 ative Example C8a (a) Compar- 0.7 0.917 15.0 223 37.8 25.5 31 142 0.22 ative Example C9a (a)

TABLE 3a-1 Ethylene-Based Polymer (A) Ethylene-Based Polymer (B) Kind of Kind of λ_(max) Content Polymer- Den- Polymer- Den- (2.0)/ of ization MFR_(A) sity_(A) [Mw/ λ_(max) ization MFR_(B) sity_(B) [Mw/ λ_(max) λ_(max) λ_(max) g′ MW ≥10{circumflex over ( )}6 Catalyst g/10 min g/cm³ Mn]_(A) (2.0) Catalyst g/10 min g/cm³ Mn]_(B) (2.0) (0.1) (0.1) Value % Example metal- 2.6 0.932 3.6 1.1 metal- 0.3 0.906 4.3 2.0 1.5 1.3 0.53 3.05 6a (a) locene locene Compar- metal- 1.8 0.927 2.7 1.1 — — — — — — — — — ative locene Example C10a (a) Example Ziegler 1.5 0.936 4.2 1.0 metal- 0.3 0.906 4.3 2.0 1.5 1.3 0.53 3.05 7a (a) locene Compar- high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pressure PE Example C11a (a) Compar- metal- 0.8 0.913 4.0 3.8 2.5 1.5 0.74 0.54 ative locene + Example high- C12a (a) pressure PE Compar- 1.0 0.921 3.8 1.0 high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pressure PE Example C13a (a)

TABLE 3a-2 Polyethylene-Based Film Physical Properties Resin Composition 1% Tensile Film Tear Tear Compositional Molding Resin Film Modulus in Impact Strength in Strength in Ratio Den- Temper- Pres- Thick- MD Direction Strength MD Direction TD Direction (A)/(A) + (B) MFR sity ature sure ness (X) (Y) Haze (Z_(MD)) (Z_(TD)) Z_(MD)/ wt % g/10 min g/cm³ ° C. MPa μm MPa J/mm % N/mm N/mm Z_(TD) Example 70 2.0 0.925 150 16.0 30 276 9.8 15.9 22 142 0.15 6a (a) Compar- 100 1.8 0.927 21.2 315 10.1 22.0 25 72 0.35 ative Example C10a (a) Example 90 1.1 0.933 180 12.1 30 449 18.3 10.3 14 110 0.13 7a (a) Compar- 80 1.3 0.931 180 12.9 30 431 13.0 6.9 10 129 0.08 ative Example C11a (a) Compar- 62 1.2 0.928 180 13.1 30 422 16.8 7.0 12 168 0.07 ative Example C12a (a) Compar- 90 0.9 0.922 180 13.8 30 248 19.2 7.8 14 149 0.09 ative Example C13a (a)

TABLE 4a-1 Ethylene-Based Polymer (A) Ethylene-Based Polymer (B) Kind of Kind of λ_(max) Content Polymer- Den- Polymer- Den- (2.0)/ of ization MFR_(A) sity_(A) [Mw/ λ_(max) ization MFR_(B) sity_(B) [Mw/ λ_(max) λ_(max) λ_(max) g′ MW ≥10{circumflex over ( )}6 Catalyst g/10 min g/cm³ Mn]_(A) (2.0) Catalyst g/10 min g/cm³ Mn]_(b) (2.0) (0.1) (0.1) Value % Example Ziegler 1.0 0.921 3.8 1.0 metallocene 0.2 0.920 5.6 2.6 2.0 1.3 0.55 1.72 8a Example 9a Compar- high- 0.7 0.924 3.9 4.3 2.6 1.7 0.26 2.94 ative pressure PE Example C14a Compar- metallocene 0.3 0.922 7.2 3.5 3.6 1.0 0.48 1.00 ative Example C15a

TABLE 4a-2 Polyethylene-Based Film Physical Properties Resin Composition 1% Tensile Film Tear Tear Compositional Molding Film Modulus in Impact Strength in Strength in Ratio Den- Temper- Thick- MD Direction Strength MD Direction TD Direction (A)/(A) + (B) MFR sity ature ness (X) (Y) Haze (Z_(MD)) (Z_(TD)) Z_(MD)/ wt % g/10 min g/cm³ ° C. μm MPa J/mm % N/mm N/mm Z_(TD) Example 8a 80 0.7 0.921 180 50 225 24.0 7.5 58 123 0.47 Example 9a 90 0.8 0.921 230 22.0 6.3 68 118 0.58 Comparative 0.9 0.921 231 21.0 6.4 47 95 0.49 Example C14a Comparative 0.8 0.921 235 22.0 8.4 62 109 0.57 Example C15a (Discussion on Results in Table 1a-1 and Table 1a-2)

Example 1a(a) to Comparative Example C1a(c) illustrate a case where an ethylene⋅1-hexene copolymer produced using a general metallocene catalyst is used for a film.

More specifically, in comparison with Comparative Example C1a(a) where as a technique commonly employed at present in general on a commercial level, about 20% of a high-pressure radical polymerization process polyethylene was blended to improve various physical properties of the copolymer for a film, in Example 1a(c) where the ethylene-based polymer (B) according to the present invention was similarly blended in a proportion of 20%, reduction in the resin pressure was observed and the melt flowability was excellent. Also, as regards film physical properties, it is apparent that a film with excellent shock strength of the impact strength being larger by nearly 40%, despite the same level of tensile modulus and haze, in other words, despite the same level of elasticity and transparency of the film, could be obtained. In Comparative Example C1a(b) where an ethylene-based copolymer that is a long-chain branch-containing ethylene-based copolymer produced using a transition metal catalyst commercially available at present but is not the ethylene copolymer (B) according to the present invention was blended similarly in a proportion of about 20%, the effect of reducing the resin pressure was obtained in the same way, but the impact strength was very small, resulting in a film having shock strength by far inferior to the film formed of the polyethylene-based resin composition of the present invention, and the transparency was also not so excellent as obtained in the present invention.

Furthermore, in Example 1a(a) and Example 1a(b), the blending amount of the ethylene-based polymer (B) according to the present invention was smaller than in the case above, and evidently, there was obtained an effect of remarkably improving the transparency by reducing the haze value from about 18% to nearly 8% without deteriorating various performances, in terms of the resin pressure or the modulus or impact strength of film, achieved in Comparative Example C1a(c) where the ethylene-based polymer (B) was not blended,

Also, by the comparison between Example 2a and Comparative Example 2a, a case where the technique of the present invention is applied in using an ethylene⋅1-butene copolymer produced with a general Ziegler catalyst for a film was illustrated.

More specifically, in Example 2a where similarly to the above-described case of a metallocene catalyst, 20% of the ethylene-based polymer (B) according to the present invention was blended with an ethylene⋅1-butene copolymer produced using a Ziegler catalyst, there was produced an excellent effect that while improving the resin pressure or the impact strength of film, achieved in Comparative Example 2a where the ethylene-based polymer (B) was not blended, an effect of remarkably improving the transparency by reducing the haze value from about 15% to 6% is obtained.

(Discussion on Results in Table 2a-1 and Table 2a-2)

Example 3a(a) to Comparative Example C7a are experimental examples planned to clearly demonstrate that similarly to experimental examples shown in Table 1a-1 and Table 1a-2, suitable performances are obtained by applying the design technique of the polyethylene-based resin composition of the present invention in using an ethylene⋅1-hexene copolymer produced with a general metallocene catalyst for a film, and illustrate a case where a polymer produced using a different metallocene catalyst was applied as the ethylene-based polymer (B) for use in the present invention.

More specifically, in Example 3a(a), Example 4a(a) and Example 5a(a), the performance of a film formed of a polyethylene-based resin composition obtained by blending, in a proportion of 10%, each of the ethylene-based polymers (B) according to the present invention produced using different metallocene catalysts with the ethylene-based polymer (A) according to the present invention, and in Example 3a(b), Example 4a(b) and Example 5a(b), the performance of a film obtained similarly by blending the same polymer in a proportion of 20%, were demonstrated by the comparison with a case of blending a high-pressure polyethylene in the same amount. In Examples using the polyethylene-based resin composition according to the present invention, a tendency of the resin pressure being in the same level or lower was observed, and the melt flowability was excellent. As regards the film physical properties, on the condition that the tensile modulus is the same, that is, the film elasticity is the same, the transparency was slightly lower than in the case of blending a high-pressure polyethylene but was improved to a sufficiently practicable level and at the same time, the impact strength was enhanced by from nearly 10% to over 80%, clearly indicating that a film excellent in the shock strength is obtained. In Comparative Example C4a(a) illustrating a case where an ethylene-based copolymer that is a known long-chain branch-containing ethylene-based copolymer produced by a silica-supported methylalumoxane catalyst of a widely known bridged bisindenylzirconocene complex and is not the ethylene-based polymer (B) according to the present invention was blended in the same manner, the impact strength was slightly enhanced, but the haze was as bad as 10% and this may pose a problem for practical use in view of film transparency.

Example 5a(c) to Comparative Example C9a are experimental examples planned to compare Example 5a(c) using a combination of an ethylene-based polymer (A) according to the present invention and an ethylene-based polymer (B) according to the present invention, with each of, as Comparative Examples, Comparative Example C8a where an ethylene-based polymer (A) according to the present invention and an ethylene-based polymer that is not the present invention in terms of having no long-chain branch are combined, and Comparative Example C9a where an ethylene-based polymer that is not the ethylene-based polymer (A) of the present invention in terms of having a long-chain branch and an ethylene-based polymer that is not the ethylene-based polymer (B) of the present invention in terms of having no long-chain branch are combined. As compared with Example 5a(c) of the present invention, it is seen that in those Comparative Examples, the resin pressure was, on the contrary, increased or the film transparency was not improved at all, which is not preferred.

(Discussion on Results in Table 3a-1 and Table 3a-2)

Example 6a(a) to Comparative Example C13a(a) are experimental examples planned to clearly demonstrate that similarly to experimental examples shown in Table 1a-1 and Table 1a-2, suitable performances are obtained by applying the design technique of the polyethylene-based resin composition of the present invention in using an ethylene⋅1-hexene copolymer produced with a general metallocene catalyst or an ethylene⋅1-butene copolymer produced with a general Ziegler catalyst for a film. The polyethylene-based resin composition was designed to increase the ratio of density_(A)/density_(B) by setting the density of the ethylene-based polymer (B) to be lower than in Examples above, and it was planned to prove that as a result of this design, a molded product very excellent in the shock strength is obtained.

More specifically, in Example 6a(a) aiming at improving an ethylene⋅1-hexene copolymer produced with a general metallocene catalyst, as compared with Comparative Example C10a(a) singularly using an ethylene⋅1-hexene copolymer having almost the same MFR, density and film impact strength, the resin pressure could be reduced by about 25% and furthermore, improvement of the transparency was revealed to be realizable, clearly demonstrating the superiority of the polyethylene-based resin composition of the present invention.

In Example 7a(a) aiming at an ethylene⋅1-butene copolymer produced with a general Ziegler catalyst, when a low-density ethylene-based polymer (B) according to the present invention was blended, as compared with Comparative Example C11a(a) as an example of a polyethylene-based resin composition obtained by blending a high-pressure polyethylene and having the same MFR and density, the resin pressure or the tensile modulus of film was slightly improved and the transparency was slightly lower than in the case of blending a high-pressure polyethylene but improved to a sufficiently practicable level. At the same time, the impact strength was enhanced by 40% or more, and it was apparent that a film with excellent shock strength is obtained. The improvement effect for this high shock strength surpassed the shock strength in Comparative Example C12a(a) that is an example of a ternary blend composition developed with the aim of achieving the same purpose.

These results clearly prove the reasonability and significance of the configuration requirements in the present invention and the superiority of the present invention to conventional techniques.

Synthesis of Metallocene Compound Synthesis Example 1 Synthesis of dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride (Metallocene Compound 11)

The compound was synthesized according to the procedure described in Example 1 of JP-A-09-87314.

Synthesis Example 2 Synthesis of dimethylsilylene(cyclopentadienyl)(3-methylindenyl)zirconium dichloride (Metallocene Compound 12)

The compound was synthesized using 1-methylindene in place of indene in the ligand synthesis by referring to the procedure described in Macromolecules 1995, 28, 3771-3778.

Synthesis Example 3 Synthesis of dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dichloride (Metallocene Compound 13)

The compound was synthesized according to the procedure described in Macromolecules 1995, 28, 3771-3778.

Synthesis Example 4 Synthesis of dimethylsilylene(cyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride (Metallocene Compound 14)

The compound was synthesized using 1-tert-butylidene in place of indene in the ligand synthesis by referring to the procedure described in Macromolecules 1995, 28, 3771-3778.

Synthesis Example 5 Synthesis of dimethylsilylene(cyclopentadienyl)(benz[e]indenyl)zirconium dichloride (Metallocene Compound 15)

The compound was synthesized using benz[e]indene in place of indene in the ligand synthesis by referring to the procedure described in Macromolecules 1995, 28, 3771-3778.

Synthesis Example 6 Synthesis of dimethylsilylene(cyclopentadienyl)(3-tert-butylcyclopentadienyl)zirconium dichloride (Metallocene Compound 16)

The compound was synthesized using tert-butylcyclopentadiene in place of indene in the ligand synthesis by referring to the procedure described in Macromolecules 1995, 28, 3771-3778.

Synthesis Example 7 Synthesis of dimethylsilylenebis(cyclopentadienyl)zirconium dichloride (Metallocene Compound 17)

A commercial product was purchased from Wako Pure Chemical Industries, Ltd.

Synthesis Example 8 Synthesis of dimethylsilylene(cyclopentadienyl)(2-(5-methyl-2-furyl)indenyl)zirconium dichloride (Metallocene Compound 21)

The compound was synthesized according to the procedure described in Example 4 of JP-A-2012-025664.

Synthesis Example 9 Synthesis of dimethylsilylene(cyclopentadienyl)(2-(5-methyl-2-furyl)-4-(4-tert-butylphenyl)indenyl)zirconium dichloride (Metallocene Compound 22)

The compound was synthesized according to the procedure described in Example 3 of JP-A-2012-025664.

Synthesis Example 10 Synthesis of racemi-dimethylsilylenebis(2-(5-trimethylsilyl-2-furyl)-4,5-dimethylcyclopentadienyl)zirconium dichloride (Metallocene Compound 23)

The compound was synthesized according to the procedure described in Example 10 of JP-T-2002-535339.

Synthesis Example 11 Synthesis of racemi-dimethylsilylenebis(2-(5-methyl-2-furyl)-4-(4-i-propylphenyl)indenyl)zirconium dichloride (Metallocene Compound 24)

The compound was synthesized by preparing a ligand according to the procedure described in Synthesis Example 1 of Japanese Patent Application No. 2011-008562 and using zirconium tetrachloride in place of hafnium tetrachloride.

Synthesis Example 12 Synthesis of racemi-dimethylsilylenebis(2-(5-methyl-2-furyl)-4-(phenyl)indenyl)zirconium dichloride (Metallocene Compound 25)

The compound was synthesized according to the procedure described in Example 1 of JP-A-2002-47313.

Synthesis Example 13 Synthesis of isopropylidene(4-tert-butylcyclopentadienyl)(3-tert-butylindenyl)zirconium dichloride (Metallocene Compound 26)

The compound was synthesized according to the procedure described in Example 1 of JP-A-05-148284.

Synthesis Example 14 Synthesis of racemi-dimethylsilylenebis(indenyl)zirconium dichloride (Metallocene Compound 27)

A commercial product was purchased from Wako Pure Chemical Industries, Ltd.

Synthesis Example 15 Synthesis of racemi-dimethylsilylenebis(2-methyl-4-phenylindenyl)zirconium dichloride (Metallocene Compound 28)

The compound was synthesized according to the procedure described in Organometallics 1994, 13, 954-963.

Synthesis Example 16 Synthesis of racemi-isopropylidenebis(indenyl)zirconium dichloride (Metallocene Compound 29)

The compound was synthesized according to the procedure described in Examples 1 and 3 of JP-A-09-20694.

Synthesis Example 17 Synthesis of racemi-ethylenebis(indenyl)zirconium dichloride (Metallocene Compound 30)

A commercial product was purchased from Wako Pure Chemical Industries, Ltd.

Example 1b

(1) Preparation of Solid Catalyst

In a nitrogen atmosphere, 5 g of silica calcined at 600° C. for 5 hours was put in a 200-ml two-neck flask and dried at reduced pressure with a vacuum pump for 1 hour while heating the flask in an oil bath at 150° C. In a nitrogen atmosphere, 22.7 mg of Metallocene Compound 11 and 23.9 mg of Metallocene Compound 21 were put in a separately prepared 100-ml two-neck flask and dissolved in 13.4 ml of dehydrated toluene, and to the resulting toluene solution of metallocene compounds, 8.6 ml of a 20% methylaluminoxane/toluene solution produced by Albemarle was added at room temperature and stirred for 30 minutes. While heating the 200-ml two-neck flask containing vacuum-dried silica in an oil bath at 40° C. and stirring the contents, the entire amount of the toluene solution above containing a reaction product of the metallocene compounds and methylaluminoxane was added and stirred at 40° C. for 1 hour. While still heating the system at 40° C., the toluene solvent was removed by distillation under reduced pressure to obtain a solid catalyst.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the solid catalyst obtained in (1) Preparation of Solid Catalyst above.

That is, 800 mL of isobutane, 50 mL of 1-hexene and 0.20 mmol of triethylahuninum were added to a 2 L-volume autoclave with an induction stirring device, then, the temperature was raised to 75° C., and the ethylene partial pressure was kept at 1.4 MPa by introducing ethylene.

Subsequently. 57 mg of the solid catalyst obtain in (1) above was injected with nitrogen and after continuing the polymerization for 60 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C., the polymerization was stopped by adding ethanol.

Incidentally, during the polymerization reaction, additional feeding of 1-hexene was performed at a feed rate proportional to the ethylene consumption rate.

As a result, the molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and just prior to stopping of the polymerization was 0.125% and 0.087%, respectively, and the amount of 1-hexene additionally fed was 2.0 mL. The amount of the thus-obtained ethylene-based polymer was 20.3 g. The polymerization results and the analysis results of the polymer obtained are shown in Table 1b.

Example 2b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 1b under the conditions shown in Table 1b by using a solid catalyst obtained in the same manner as in (1) of Example 1b except for using 30.5 mg of Metallocene Compound 22 in place of Metallocene Compound 21.

The amount of the thus-obtained ethylene-based polymer was 43.3 g. The results are shown in Table 1b.

Example 3b

(1) Preparation of Solid Catalyst

Preparation of Solid Catalyst was performed in the same manner as in (1) of Example 1b except for using 22.4 mg of Metallocene Compound 27 in place of Metallocene Compound 21.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the solid catalyst obtained in (1) above.

That is, 50 g of polyethylene-made pellets subjected to full dehydration and deoxidation and 0.20 mmol of triethylaluminum were added to a stainless steel-made autoclave having an internal volume of 2 liter and having stirring and temperature control devices, and the temperature was raised to 75° C. under stirring. After introducing 1.5 ml of 1-hexene and ethylene until the partial pressure became 1.4 MPa, 80 mg of the solid catalyst obtained above was injected with a nitrogen gas, and polymerization was performed for 90 minutes.

Incidentally, during the polymerization reaction, additional feeding of 1-hexene was performed at a feed rate proportional to the ethylene consumption rate. As a result, the molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and just prior to stopping of the polymerization was 0.065% and 0.076%, respectively, and the amount of 1-hexene additionally fed was 5.5 mL.

Production of 35.0 g of polyethylene resulted. The polymerization results are shown together in Table 1b.

Example 4b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3 under the conditions shown in Table 1b by using a solid catalyst obtained in the same manner as in (1) of Example 3b except for using 9.1 mg of Metallocene Compound 11 and 35.9 mg of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 28.5 g. The results are shown in Table 1b.

Example 5b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 4b under the conditions shown in Table 1b by using a solid catalyst obtained in the same manner as in (1) of Example 4b except for using 50.3 mg of Metallocene Compound 28 in place of Metallocene Compound 27.

Incidentally, 250 mL of H₂ and 1.5 ml of 1-hexene were added before initiation of the polymerization and furthermore, during the polymerization reaction, additional feeding of H₂ and 1-hexene was performed at feed rates proportional to the ethylene consumption rate.

The amount of the thus-obtained ethylene-based polymer was 42.0 g. The results are shown in Table 1b.

Comparative Example 1b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3b under the conditions shown in Table 1b by using a solid catalyst obtained in the same manner as in (1) of Example 3b except for using 45.5 mg of Metallocene Compound 11 and not using Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 49.5 g. The results are shown in Table 1b.

Comparative Example 2b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3b under the conditions shown in Table 1b by using a solid catalyst obtained in the same manner as in (1) of Example 3b except for not using Metallocene Compound 11 and using 44.9 mg of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 22.5 g. The results are shown in Table 1b.

Comparative Example 3b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Comparative Example 2b under the conditions shown in Table 1b.

The amount of the thus-obtained ethylene-based polymer was 44.5 g. The results are shown in Table 1b.

TABLE 54 [Table 1b] Polymerization Charge Catalyst Amount Amount Essential Essential of Polymer- of 1- Component (A-1b) Component (A-2b) Catalyst ization H2/C2 Hexene Kind μmol Kind μmol mg Method % ml Example 1b Metallocene 50 Metallocene 50 57 S 0.11 50 Compound 11 Compound 21 Example 2b Metallocene 50 Metallocene 50 50 S 0.55 50 Compound 11 Compound 22 Example 3b Metallocene 50 Metallocene 50 80 G 0.07 1.5 Compound 11 Compound 27 Example 4b Metallocene 20 Metallocene 80 107 G 0.11 1.5 Compound 11 Compound 27 Example 5b Metallocene 20 Metallocene 80 42 G 0.35 1.5 Compound 11 Compound 28 Comparative Metallocene 100 — — 64 G 0.10 1.5 Example 1b Compound 11 Comparative — — Metallocene 100 62 G 0.08 1.5 Example 2b Compound 27 Comparative — — Metallocene 100 74 G 0.12 0.4 Example 3b Compound 27 Polymerization Addi- Analysis of Polymer tional W_(c) Amount Activity λmax Value of 1- g/g MFR Den- (2.0)/ (MW ≥ Hexene catalyst g/10 sity λ_(max) λ_(max) λmax g_(c)′ 10{circumflex over ( )}6) ml hour min g/cm3 (0.1) (2.0) (0.1) Value % Example 1b 2.0 357 1.4 0.932 1.2 3.6 3.0 0.45 2.2 Example 2b 8.0 866 2.7 0.925 1.0 1.9 1.9 0.60 1.2 Example 3b 5.5 292 12 0.930 2.5 7.8 3.1 0.39 1.2 Example 4b 4.0 177 0.4 0.922 2.3 3.2 1.4 0.53 0.9 Example 5b 8.5 662 0.4 0.911 1.3 1.7 1.3 0.57 2.4 Comparative 9.5 516 38 0.927 — — — 0.36 0.8 Example 1b Comparative 3.0 244 0.01 0.912 — — — 0.59 2.0 Example 2b Comparative 1.0 299 0.2 0.937 1.0 1.1 1.1 0.69 0.7 Example 3b

As seen from Table 1b, in the case of an ethylene-based polymer obtained using only Metallocene Compound 11 of the component (A-1b), as in Comparative Example 1b, despite low hydrogen polymerization conditions, it was difficult to sufficiently reduce MFR, and the W_(C) value was small, and in the case of an ethylene-based polymer obtained using only Metallocene Compound 27 of the component (A-2b), as in Comparative Examples 2b and 3b, only a polymer where the g_(C)′ value is as large as about 0.6 or more or the λ_(max)(2.0) or λ_(max)(2.0)/λ_(max)(0.1) is small could be obtained, and enhancement of moldability could not be promised. On the other hand, in the case of an ethylene-based polymer obtained by the same gas-phase polymerization by using both Metallocene Compound 11 and Metallocene Compound 27, as in Example 3b, an ethylene-based polymer where all of λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value were large to indicate well developing of a long-chain branched structure was obtained, and it is understood that moldability was improved. In the case of an ethylene-based polymer of Example 4b obtained by decreasing the amount of Metallocene Compound 11 and increasing the amount of Metallocene Compound 27, the λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value were smaller than in Example 3b and a long-chain branched structure was slightly less developed, but it is understood that the moldability was excellent relative to ethylene-based polymers obtained by using respective metallocene compounds individually. In the case of an ethylene-based polymer of Example 5b using Metallocene Compound 28 as a different component (A-2b), the W_(C) value was greatly improved while maintaining the λ_(max)(2.0)/λ_(max)(0.1) and g_(C)′ value comparable to those in Example 4b. In the case of ethylene-based polymers of Example 1b and Example 2b where Metallocene Compound 21 or Metallocene Compound 22 was similarly used as a different component (A-2b) and a slurry polymerization method was performed, λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1) and W_(C) value were large enough and the g_(C)′ value was sufficiently small, and the polymer was proved to have a long-chain branched structure useful in enhancing the molding characteristics.

Example 6b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3b under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in (1) of Example 3b except for using 37.1 mg of Metallocene Compound 12 in place of Metallocene Compound 11 and using 4.5 mg of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 38.5 g. The results are shown in Table 2b.

Example 7b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in Example 6b except for using 4.3 mg of Metallocene Compound 29 in place of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 31.0 g. The results are shown in Table 2b.

Comparative Example 4b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in Example 6b except for using 41.3 mg of Metallocene Compound 12 and not using Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 31.0 g. The results are shown in Table 2b.

Comparative Example 5b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Comparative Example 4b under the conditions shown in Table 2b.

The amount of the thus-obtained ethylene-based polymer was 42.5 g. The results are shown in Table 2b.

Example 8b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 1b under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in (1) of Example 1b except for using 39.1 mg of Metallocene Compound 13 in place of Metallocene Compound 11 and using 1.5 mg of Metallocene Compound 25 in place of Metallocene Compound 21.

Incidentally, 100 mL of H₂ and 40 ml of 1-hexene were added before initiation of the polymerization and furthermore, during the polymerization reaction, additional feeding of H₂ and 1-hexene was performed at feed rates proportional to the ethylene consumption rate.

The amount of the thus-obtained ethylene-based polymer was 48.5 g. The results are shown in Table 2b.

Example 9b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Example 8b under the conditions shown in Table 2b.

The amount of the thus-obtained ethylene-based polymer was 48.5 g. The results are shown in Table 2b.

Example 10b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3b under the conditions shown in Table 2b by using the solid catalyst obtained in Example 8b.

Incidentally, 370 mL of H₂ and 1.5 ml of 1-hexene were added before initiation of the polymerization and furthermore, during the polymerization reaction, additional feeding of H₂ and 1-hexene was performed at feed rates proportional to the ethylene consumption rate.

The amount of the thus-obtained ethylene-based polymer was 8.5 g. The results are shown in Table 2b.

Comparative Example 6b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in Example 8b except for using 39.9 mg of Metallocene Compound 13 and not using Metallocene Compound 25.

The amount of the thus-obtained ethylene-based polymer was 31.4 g. The results are shown in Table 2b.

Example 11b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in Example 6b except for using 40.9 mg of Metallocene Compound 14 in place of Metallocene Compound 12.

Incidentally, 60 mL of H₂ and 1.5 ml of 1-hexene were added before initiation of the polymerization and furthermore, during the polymerization reaction, additional feeding of H₂ and 1-hexene was performed at feed rates proportional to the ethylene consumption rate.

The amount of the thus-obtained ethylene-based polymer was 59.0 g. The results are shown in Table 2b.

Example 12b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 2b by using a solid catalyst obtained in the same manner as in Example 11 b except for using 35.9 mg of Metallocene Compound 15 in place of Metallocene Compound 14 and using 9.0 mg of Metallocene Compound 27. The amount of the thus-obtained ethylene-based polymer was 30.5 g. The results are shown in Table 2b.

TABLE 55 [Table 2b] Polymerization Charge Catalyst Amount Amount Essential Essential of Polymer- of 1- Component (A-1b) Component (A-2b) Catalyst ization H2/C2 Hexene Kind μmol Kind μmol mg Method % ml Example 6b Metallocene 90 Metallocene 10 60 G 0.11 1.5 Compound 12 Compound 27 Example 7b Metallocene 90 Metallocene 10 56 G 0.17 1.5 Compound 12 Compound 29 Comparative Metallocene 100 — — 44 G 0.12 1.5 Example 4b Compound 12 Comparative Metallocene 100 — — 181 G 0.18 1.5 Example 5b Compound 12 Example 8b Metallocene 98 Metallocene 2 175 S 0.39 40 Compound 13 Compound 25 Example 9b Metallocene 98 Metallocene 2 175 S 0.95 40 Compound 13 Compound 25 Example 10b Metallocene 98 Metallocene 2 49 G 0.48 2 Compound 13 Compound 25 Comparative Metallocene 100 — — 160 S 0.20 40 Example 6b Compound 13 Example 11b Metallocene 90 Metallocene 10 57 G 0.12 1.5 Compound 14 Compound 27 Example 12b Metallocene 80 Metallocene 20 130 G 0.09 1.5 Compound 15 Compound 27 Polymerization Addi- Analysis of Polymer tional W_(c) Amount Activity λmax Value of 1- g/g MFR Den- (2.0)/ (MW ≥ Hexene catalyst/ g/10 sity λ_(max) λ_(max) λmax g_(c)′ 10{circumflex over ( )}6) ml hour min g/cm3 (0.1) (2.0) (0.1) Value % Example 6b 6.0 426 0.2 0.919 1.4 1.9 1.4 0.45 0.4 Example 7b 5.0 370 0.4 0.923 2.3 3.5 1.5 0.41 1.2 Comparative 4.0 470 0.2 0.924 1.0 1.5 1.5 0.42 0.3 Example 4b Comparative 6.0 157 2.7 0.930 1.9 4.1 2.2 0.47 0.2 Example 5b Example 8b 8.0 278 0.3 0.911 2.0 3.4 1.7 0.49 0.7 Example 9b 8.0 278 3.9 0.913 1.7 5.9 3.5 0.50 0.2 Example 10b 1.0 115 2.7 0.927 2.8 4.7 1.7 0.65 0.2 Comparative 7.2 196 8.1 0.929 2.6 6.5 2.5 0.84 1.5 Example 6b Example 11b 10 689 0.8 0.922 1.6 2.1 1.3 0.63 0.1 Example 12b 5.0 156 0.1 0.920 — — — 0.47 2.5

The results of the olefin polymerization catalyst of the present invention where each of Metallocene Compounds 12 to 15 as a metallocene different from the component (A-1b) used in Table 1b was combined with Metallocene Compound 27 or the like used as the component (A-2b) in Table 1b are shown in Table 2b. Comparison with Comparative Example 4b and Comparative Example 6b revealed that the ethylene-based polymers obtained are excellent in terms of λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value relative to a polymer using the component (A-1b) alone.

Example 13b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 1b except for using 36.4 mg of Metallocene Compound 16 in place of Metallocene Compound 11 and using 6.1 mg of Metallocene Compound 22 in place of Metallocene Compound 21.

The amount of the thus-obtained ethylene-based polymer was 11.0 g. The results are shown in Table 3b.

Example 14b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 13b except for using 6.8 mg of Metallocene Compound 23 in place of Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 30.0 g. The results are shown in Table 3b.

Example 15b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 13b except for using 8.5 mg of Metallocene Compound 24 in place of Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 20.0 g. The results are shown in Table 3b.

Example 16b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced in the same manner as in Example 15b under the conditions shown in Table 3b.

The amount of the thus-obtained ethylene-based polymer was 16.5 g. The results are shown in Table 3b.

Example 17b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 3b except for using 20.2 mg of Metallocene Compound 16 in place of Metallocene Compound 11.

The amount of the thus-obtained ethylene-based polymer was 46.5 g. The results are shown in Table 3b.

Comparative Example 7b-1

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 17b except for using 40.5 mg of Metallocene Compound 16 and not using Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 42.0 g. The results are shown in Table 3b.

Comparative Example 7b-2

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 3b by using a solid catalyst obtained in the same manner as in Example 13b except for using 12.1 mg of Metallocene Compound 16 and using 39.0 mg of Metallocene Compound 31 in place of Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 13.5 g. The results are shown in Table 3b.

TABLE 56 [Table 3b] Polymerization Catalyst Amount Charge Additional Activity Essential Essential of Polymer- Amount of Amount of g/g MFR Component (A-1b) Component (A-2b) Catalyst ization H2/C2 1-Hexene 1-Hexene catalyst/ g/10 Kind μmol Kind μmol mg Method % ml ml hour min Example 13b Metallocene 90 Metallocene 10 68 S 0.05 150 1.0 162 0.9 Compound 16 Compound 22 Example 14b Metallocene 90 Metallocene 10 54 S 0.13 150 6.5 550 0.8 Compound 16 Compound 23 Example 15b Metallocene 90 Metallocene 10 43 S 0.29 50 3.0 461 6.2 Compound 16 Compound 24 Example 16b Metallocene 90 Metallocene 10 47 S 0.10 50 2.0 354 1.2 Compound 16 Compound 24 Example 17b Metallocene 50 Metallocene 50 58 G 0.13 1.5 7.5 535 0.2 Compound 16 Compound 27 Comparative Metallocene 100 — — 62 G 0.13 1.5 7.5 451 24 Example 7b-1 Compound 16 Comparative Metallocene 30 Metallocene 70 71 S 0.08 60 2.0 189 0.3 Example 7b-2 Compound 16 Compound 31 Polymer- Analysis of Polymer Amount of Amount of Amount of Amount of ization W_(c) Value Soluble Soluble Soluble Soluble Density λ_(max) λ_(max) λmax (2.0)/ g_(c)′ (MW ≥ Fraction at- Fraction at Fraction at Fraction at g/cm3 (0.1) (2.0) λmax (0.1) Value 10{circumflex over ( )}6) % 15° C. [w %] 0° C. [w %] 20° C. [w %] 40° C. [w %] Example 13b 0.917 1.0 2.0 2.0 0.44 1.7 0.4 0.4 1.8 7.7 Example 14h 0.913 1.0 1.8 1.8 0.68 0.3 0.4 0.4 1.3 10.2 Example 15b 0.917 1.0 1.9 1.9 0.79 0.1 3.7 4.8 17.2 30.7 Example 16b 0.925 1.7 2.6 1.5 0.69 0.7 1.3 1.5 4.4 15.2 Example 17b 0.920 1.0 1.7 1.7 0.48 0.3 — — — — Comparative 0.930 3.1 4.7 1.5 0.38 0.1 0.3 0.8 2.2 5.2 Example 7b-1 Comparative 0.921 1.4 1.3 0.9 0.78 0.4 0.6 0.8 1.3 3.6 Example 7b-2

The results of the olefin polymerization catalyst of the present invention where Metallocene Compound 16 as a metallocene different from the component (A-1b) used in Table 1b or Table 2b was combined with Metallocene Compound 22, Metallocene Compound 27 or the like used as the component (A-2b) in Table 1b are shown in Table 3b. Comparison with Comparative Example 7b revealed that the ethylene-based polymers obtained are excellent in terms of λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value relative to a polymer using Metallocene 16 as the component (A-1b) alone.

Example 18b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 1b except for using 33.1 mg of Metallocene Compound 17 in place of Metallocene Compound 11 and using 3.1 mg of Metallocene Compound 22 in place of Metallocene Compound 21.

The amount of the thus-obtained ethylene-based polymer was 85.8 g. The results are shown in Table 4b.

Example 19b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 18b except for using 34.5 mg of Metallocene Compound 17 and using 0.8 mg of Metallocene Compound 25 in place of Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 49.5 g. The results are shown in Table 4b.

Example 20b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in (2) of Example 3b under the conditions shown in Table 4b by using the solid catalyst obtained in Example 19b.

The amount of the thus-obtained ethylene-based polymer was 25.5 g. The results are shown in Table 4b.

Example 21b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Example 20b under the conditions shown in Table 4b.

The amount of the thus-obtained ethylene-based polymer was 23.5 g. The results are shown in Table 4b.

Example 22b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 20b except for using 32.4 mg of Metallocene Compound 17 and using 3.5 mg of Metallocene Compound 26 in place of Metallocene Compound 25.

The amount of the thus-obtained ethylene-based polymer was 22.9 g. The results are shown in Table 4b.

Example 23b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 18b except for using 32.4 mg of Metallocene Compound 17 and using 3.1 mg of Metallocene Compound 27 in place of Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 72.0 g. The results are shown in Table 4b.

Example 24b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Example 23b under the conditions shown in Table 4b.

The amount of the thus-obtained ethylene-based polymer was 47.1 g. The results are shown in Table 4b.

Example 25b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced by the same method as in Example 23b under the conditions shown in Table 4b.

The amount of the thus-obtained ethylene-based polymer was 100.2 g. The results are shown in Table 4b.

Example 26b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 24b except for using 33.5 mg of Metallocene Compound 17 and using 1.8 mg of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 29.0 g. The results are shown in Table 4b.

Example 27b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 20b except for using 33.8 mg of Metallocene Compound 17 and using 1.9 mg of Metallocene Compound 28 in place of Metallocene Compound 25.

The amount of the thus-obtained ethylene-based polymer was 40.0 g. The results are shown in Table 4b.

Comparative Example 8b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 20b except for using 34.8 mg of Metallocene Compound 17 and not using Metallocene Compound 25.

The amount of the thus-obtained ethylene-based polymer was 56.8 g. The results are shown in Table 4b.

Comparative Example 9b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 18b except for using 34.8 mg of Metallocene Compound 17 and not using Metallocene Compound 22.

The amount of the thus-obtained ethylene-based polymer was 14.5 g. The results are shown in Table 4b.

Comparative Example 10b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was in the same manner as in Comparative Example 9b under the conditions shown in Table 4b.

The amount of the thus-obtained ethylene-based polymer was 79.4 g. The results are shown in Table 4b.

Comparative Example 11b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b by using a solid catalyst obtained in the same manner as in Example 23b except for using 44.9 mg of Metallocene Compound 27 and not using Metallocene Compound 17.

The amount of the thus-obtained ethylene-based polymer was 54.9 g. The results are shown in Table 4b.

Comparative Example 12b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced in the same manner as in Comparative Example 11b under the conditions shown in Table 4b.

The amount of the thus-obtained ethylene-based polymer was 37.2 g. The results are shown in Table 4b.

Comparative Example 13b

Production of Ethylene-Based Polymer:

An ethylene-based polymer was produced under the conditions shown in Table 4b in the same manner as in Comparative Example 11b except for using 41.8 mg of Metallocene Compound 30 in place of Metallocene Compound 27.

The amount of the thus-obtained ethylene-based polymer was 129.6 g. The results are shown in Table 4b.

TABLE 57 [Table 4b] Polymerization Charge Catalyst Amount Amount Essential Essential of Polymer- of 1- Component (A-1b) Component (A-2b) Catalyst ization H2/C2 Hexene Kind μmol Kind μmol mg Method % ml Example 18b Metallocene 95 Metallocene 5 353 S 0.77 50 Compound 17 Compound 22 Example 19b Metallocene 99 Metallocene 1 276 S 0.73 40 Compound 17 Compound 25 Example 20b Metallocene 99 Metallocene 1 255 G 0.08 1.5 Compound 17 Compound 25 Example 21b Metallocene 99 Metallocene 1 255 G 0.63 1.5 Compound 17 Compound 25 Example 22b Metallocene 93 Metallocene 7 225 G 0.10 1.5 Compound 17 Compound 26 Example 23b Metallocene 93 Metallocene 7 396 S 0.18 40 Compound 17 Compound 27 Example 24b Metallocene 93 Metallocene 7 390 S 0.12 20 Compound 17 Compound 27 Example 25b Metallocene 93 Metallocene 7 422 S 0.10 80 Compound 17 Compound 27 Example 26b Metallocene 96 Metallocene 4 381 S 0.09 20 Compound 17 Compound 27 Example 27b Metallocene 97 Metallocene 3 397 G 0.13 2.0 Compound 17 Compound 28 Comparative Metallocene 100 — — 533 G 0.13 3.6 Example 8b Compound 17 Comparative Metallocene 100 — — 153 S 0.10 80 Example 9b Compound 17 Comparative Metallocene 100 — — 686 S 0.17 40 Example 10b Compound 17 Comparative — — Metallocene 100 68 S 0.69 20 Example 11b Compound 27 Comparative — — Metallocene 100 75 S 1.49 20 Example 12b Compound 27 Comparative — — Metallocene 100 137 S 0.23 40 Example 13b Compound 30 Polymerization Addi- Analysis of Polymer tional W_(c) Amount Activity λmax Value of 1- g/g MFR Den- (2.0)/ (MW ≥ Hexene catalyst g/10 sity λ_(max) λ_(max) λmax g_(c)′ 10{circumflex over ( )}6 ml hour min g/cm3 (0.1) (2.0) (0.1) Value % Example 18b 19 243 1.0 0.919 1.0 2.1 2.1 0.54 0.8 Example 19b 11 179 4.7 0.920 1.2 5.0 4.2 0.38 0.3 Example 20b 4.0 67 0.9 0.933 3.9 10.8 2.8 0.46 4.6 Example 21b 3.0 61 11 0.939 1.9 4.1 2.2 0.54 0.1 Example 22b 3.5 68 0.2 0.929 1.0 1.5 1.5 0.42 3.6 Example 23b 16 182 5.7 0.931 2.7 9.3 3.4 0.42 1.9 Example 24b 4.5 121 4.7 0.946 1.0 3.7 3.7 0.43 2.6 Example 25b 25 238 1.6 0.914 1.1 1.7 1.5 0.47 2.8 Example 26b 2.0 76 15 0.950 2.7 8.4 3.1 0.39 0.6 Example 27b 8.0 67 0.6 0.921 4.4 7.3 1.7 0.44 5.5 Comparative 17 71 1068 0.919 — — — — — Example 8b Comparative 4.9 95 325 0.937 — — — — — Example 9b Comparative 16 116 309 0.941 — — — — — Example 10b Comparative 7.0 808 0.2 0.930 1.0 1.0 1.0 0.55 1.9 Example 11b Comparative 6.0 496 4.1 0.938 1.3 2.3 1.8 0.65 0.5 Example 12b Comparative 37 946 0.5 0.922 4.6 5.0 1.1 0.49 2.2 Example 13b

The results of the olefin polymerization catalyst of the present invention where Metallocene Compound 17 as a metallocene different from the component (A-1b) used in Tables 1b to 3b was combined with Metallocene Compound 22, Metallocene Compound 25, Metallocene Compound 27, Metallocene Compound 28 or the like used as the component (A-2b) in Table 1b are shown in Table 4b. Comparison with Comparative Example 8b to Comparative Example 12b revealed that the ethylene-based polymers obtained are excellent in terms of λ_(max)(2.0), λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value relative to a polymer where Metallocene Compound 17 as the component (A-1b) or Metallocene Compound 27 as the component (A-2b) was used alone. Furthermore, comparison with Comparative Example 13 revealed that the ethylene-based polymer obtained according to the present invention has a more proper value for the λ_(max)(2.0)/λ_(max)(0.1), g_(C)′ value and W_(C) value than the ethylene-based polymer obtained using ethylenebisindenylzirconium dichloride (Metallocene Compound 30) known to provide for an excellent long-chain branched structure.

Example 28b

Production of Ethylene-Based Polymer

An ethylene-based polymer was produced under the conditions shown in Table 5b by using the solid catalyst synthesized in Example 6b. That is, in a continuous gas-phase polymerization apparatus (internal volume: 100 L, diameter of fluidized bed: 10 cm, seed polymer of fluidized bed (dispersant): 1.5 kg) which is set such that the molar ratio of 1-hexene/ethylene is 0.007, the molar ratio of hydrogen/ethylene is 2.5×10⁻³, the nitrogen concentration is 30 mol %, the total pressure is 0.8 MPa and the temperature is 75° C., a hexane solution (0.03 mmol/ml) of triethylaluminum was fed at 7 ml/h and while keeping the gas composition and the temperature constant, polymerization was performed by intermittently feeding the solid catalyst so as to achieve a production amount of about 300 g per hour. The activity was 336 g/(g catalyst·hour). The results are shown in Table 5b.

Example 29b

Production of Ethylene-Based Polymer

An ethylene-based polymer was produced under the conditions shown in Table 5 in the same manner as in Example 28b. The results are shown in Table 5b.

Example 30b

Production of Ethylene-Based Polymer

An ethylene-based polymer was produced under the conditions shown in Table 5b in the same manner as in Example 28b except for setting the polymerization temperature to 65° C. The results are shown in Table 5b.

Example 31b

Production of Ethylene-Based Polymer

An ethylene-based polymer was produced under the conditions shown in Table 5b in the same manner as in Example 30b except for using 6.3 mg of Metallocene Compound 28 in place of Metallocene Compound 27. The results are shown in Table 5b.

Comparative Example 14b

Production of Ethylene-Based Polymer

An ethylene-based polymer having MFR of 0.8 g/10 min and a density of 0.914 g/cm³ was obtained in the same manner as in (2) Production of Ethylene-Based Polymer (B-1) of Example 1a(a). The results are shown in Table 5b. While continuing the continuous operation, the molar ratio of hexene/ethylene was increased from 0.012 so as to produce a lower density ethylene-based polymer, as a result, despite no additional addition of hydrogen that is a molecular weight adjusting agent, MFR started increasing from 0.8 g/10 min with time, and it was difficult to produce a low-MFR and low-density ethylene-based polymer as in Examples 29b to 31b.

TABLE 5b Catalyst Polymerization Essential Component Essential Component Amount of Polymer- 1-Hexene/ (A-1b) (A-2b) Catalyst ization H2/C2 C2 Kind μmol Kind μmol g/h Method % mol % Example 28b Metallocene 90 Metallocene 10 0.18 G 0.25 0.7 Compound 12 Compound 27 Example 29b Metallocene 90 Metallocene 10 0.14 G 0.20 1.2 Compound 12 Compound 27 Example 30b Metallocene 90 Metallocene 10 0.18 G 0.10 1.4 Compound 12 Compound 27 Example 31b Metallocene 90 Metallocene 10 0.33 G 0.15 0.7 Compound 12 Compound 28 Comparative Metallocene 100 — — 0.38 G 0.15 1.2 Example 14b Compound 12 Polymerization Analysis of Polymer Activity W_(c) g/g MFR Value TEA catalyst/ g/10 Density λ_(max) λ_(max) λ_(max) (2.0)/ g_(c)′ (MW ≥10{circumflex over ( )}6) mmol/h hour min g/cm3 (0.1) (2.0) λ_(max) (0.1) Value % Example 28b 0.21 336 0.3 0.921 2.0 2.5 1.3 0.44 0.02 Example 29b 0.23 620 0.7 0.913 1.8 2.7 1.5 0.56 0.01 Example 30b 0.23 516 1.6 0.907 1.8 3.7 2.1 0.55 0.01 Example 31b 0.25 420 0.3 0.901 1.5 2.6 1.7 0.53 0.7 Comparative 0.23 320 0.8 0.914 1.7 3.1 1.8 0.46 0.1 Example 14b (I) [Synthesis of Metallocene Compound] Metallocene Compound A: Synthesis of dimethylsilylene(4-(4-trimethylsilyl-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride (1-1) Synthesis of 4-(4-trimethylsilyl-phenyl)-indene

In a 500-ml flask, 10.0 g (51.5 mmol) of 4-trimethylsilylphenylboronic acid and 200 ml of dimethoethane were added to make a solution and thereafter, 27.3 g (128 mmol) of potassium phosphate, 100 ml of water, 8.37 g (43.0 mmol) of 4-bromoindene, 0.22 g (0.86 mmol) of triphenylphosphine, and 0.300 g (0.430 mmol) of PdCl₂(PPh₃)₂ were added in sequence and stirred under reflux for 12 hours. After cooling to room temperature, 100 ml of water was added. The organic phase was separated and then, the aqueous phase was extracted twice with 100 ml of ethyl acetate. The obtained organic phases were mixed and washed with a saline solution, and the resulting organic phase was dried by adding sodium sulfate. Sodium sulfate was filtered, and the solvent was removed by distillation under reduced pressure. The residue was purified on a silica gel column to obtain 9.0 g (yield: 79%) of 4-(4-trimethylsilyl-phenyl)-indene as a yellow liquid.

(1-2) Synthesis of (4-(4-trimethylsilyl-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane

In a 200-ml flask, 16.2 g (61.2 mmol) of 4-(4-trimethylsilyl-phenyl)-indene and 100 ml of THF were added to make a solution and after cooling to −78° C., 29.4 ml (173.5 mmol) of an n-butyllithium/hexane solution (2.5M) was added. The system was returned to room temperature and stirred for 4 hours. In a separately prepared 300-ml flask, 14.8 ml (122 mmol) of dimethyldichlorosilane and 20 ml of THF were added to make a solution and after cooling to −78° C., the reaction solution obtained above was added. The system was returned to room temperature and stirred for 12 hours. The volatile matter was removed by distillation under reduced pressure to obtain 21.8 g of a yellow solution. To this yellow solution, 80 ml of THF was added to make a solution, and 36.7 ml (73.5 mmol) of a CpNa/THF solution (2M) was added at −30° C. The system was returned to room temperature and stirred for 1 hour and after adding 100 ml of ice water thereto, the solution was extracted twice with 100 ml of ethyl acetate. The obtained organic phases were mixed and washed with a saline solution, and the resulting organic phase was dried by adding sodium sulfate. Sodium sulfate was filtered, and the solvent was removed by distillation under reduced pressure.

The residue was purified on a silica gel column to obtain 12.0 g (yield: 51%) of (4-(4-trimethylsilyl-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane as a yellow liquid.

(1-3) Synthesis of dimethylsilylene(4-(4-trimethylsilyl-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride

In a 300-ml flask, 1.20 g (3.00 mmol) of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane and 20 ml of diethyl ether were added, and the mixture was cooled to −70° C. Thereto, 2.60 ml (6.60 mmol) of a 2.5 mol/L n-butyllithium-n-hexane solution was added dropwise and after the completion of dropwise addition, the system was returned to room temperature and stirred for 2 hours. The solvent of the reaction solution was removed by distillation under reduced pressure, and 30 ml of dichloromethane was added. The resulting solution was cooled to −70° C. in a dry ice-methanol bath, and 0.770 g (3.30 mmol) of zirconium tetrachloride was added thereto. The mixture was stirred one night while allowing it to gradually return to room temperature and from a solution obtained by filtering the reaction solution, the solvent was removed by distillation under reduced pressure, as a result, a yellow powder was obtained. This powder was recrystallized from 10 ml of toluene to obtain 0.500 g (yield: 31%) of dimethylsilylene(4-(4-trimethyl-silylphenyl)indenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal.

¹H-NMR Values (CDCl₃): δ0.21 (s, 3H), δ0.23 (s, 9H), δ0.43 (s, 3H), δ5.48 (m, 1H), δ5.51 (m, 1H), δ5.81 (d, 1H), δ6.60 (m, 1H), δ6.66 (m, 1H), δ6.95 (dd, 1H), δ7.13 (s, 1H), δ7.39 (dd, 2H), δ7.57 (d, 2H), δ7.95 (d, 2H).

Metallocene Compound B: Synthesis of dimethylsilylene(4-(4-chloro-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride

(2-1) Synthesis of 4-(4-chloro-phenyl)-indene

The synthesis was performed by the same procedure as in Metallocene Compound A (1-1) by using 4-chlorophenylboronic acid in place of 4-trimethylsilylphenylboronic acid in the synthesis of 4-(4-trimethylsilyl-phenyl)-indene to obtain a white solid of 4-(4-chloro-phenyl)-indene in a yield of 69%.

(2-2) Synthesis of (4-(4-chloro-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane

The synthesis was performed by the same procedure as in Metallocene Compound A (1-2) by using 4-(4-chloro-phenyl)-indene in place of 4-(4-trimethylsilyl-phenyl)-indene to obtain a pale yellow solid of (4-(4-chloro-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane in a yield of 52%.

(2-3) Synthesis of dimethylsilylene(4-(4-chloro-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride

The synthesis was performed by the same procedure as in Metallocene Compound A (1-3) by using (4-(4-chlorophenyl)indenyl)(cyclopentadienyl)dimethylsilane in place of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane to obtain dimethylsilylene(4-(4-chloro-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal.

¹H-NMR Values (CDCl₃): δ0.87 (s, 3H), δ1.08 (s, 3H), δ5.89 (m, 1H), δ5.94 (m, 1H), δ6.24 (d, 1H), δ6.78 (m, 1H), δ6.84 (m, 1H), δ7.12 (d, 1H), δ7.19 (dd, 1H), δ7.39 (d, 1H), δ7.44 (m, 3H), δ7.61 (d, 2H).

Metallocene Compound C: Synthesis of dimethylsilylene(4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)zirconium dichloride

(3-1) Synthesis of 4-(2-(5-methyl)-furyl)-indene

In a 500-ml flask, 2.52 g (30.7 mmol) of 2-methylfuran and 30 ml of THF were added to make a solution and after cooling to −78° C., 14.7 ml (36.9 mmol) of an n-butyllithium-hexane solution (2.5M) was added. The system was returned to room temperature and stirred for 4 hours. In a separately prepared 300-ml flask. 4.18 g (30.7 mmol) of zinc chloride and 10 ml of THF were added to make a suspension and after cooling to 0° C., the reaction solution obtained above was added. The system was returned to room temperature and stirred for 1 hour. Furthermore, in a separately prepared 300 mil-volume flask, 0.35 g (1.84 mmol) of copper(I) iodide, 0.690 g (0.932 mmol) of Pd(dppf)Cl₂, 3.00 g (15.3 mmol) of 4-bromoindene and 5 ml of DMA were added to make a suspension, and the reaction solution obtained above was added and stirred under reflux for 15 hours. After cooling to room temperature, 50 ml of water was added. The organic phase was separated and then, the aqueous phase was extracted twice with 50 ml of ethyl acetate. The obtained organic phases were mixed and washed twice with 50 ml of water and washed once with 50 ml of a saline solution, and the resulting organic phase was dried by adding sodium sulfate. Sodium sulfate was filtered, and the solvent was removed by distillation under reduced pressure. The residue was purified on a silica gel column to obtain 2.10 g (yield: 70%) of 4-(2-(5-methyl)-furyl)-indene as a yellow liquid.

(3-2) Synthesis of (4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)dimethylsilane

The synthesis was performed by the same procedure as in Metallocene Compound A (1-2) by using 4-(2-(5-methyl)-furyl)-indene in place of 4-(4-trimethylsilyl-phenyl)-indene to obtain a pale yellow solid of (4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)dimethylsilane in a yield of 38%.

(3-3) Synthesis of dimethylsilylene(4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)zirconium dichloride

The synthesis was performed by the same procedure as in Metallocene Compound A (1-3) by using (4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)dimethylsilane in place of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane to obtain dimethylsilylene(4-(2-(5-methyl)-furyl)-indenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal (yield: 25%).

¹H-NMR Values (CDCl₃): δ0.00 (s, 3H), δ0.18 (s, 3H), δ1.79 (s, 3H), δ5.22 (m, 1H), δ5.32 (m, 1H), δ5.64 (m, 1H), δ5.72 (d, 1H), δ6.33 (m, 1H), δ6.35 (m, 1H), δ6.70 (m, 2H), δ6.82 (d, 1H), δ7.43 (d, 1H), δ7.60 (d, 1H).

Metallocene Compound D: Synthesis of dimethylsilylene(4-(4-methoxy-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride

(4-1) Synthesis of 4-(4-methoxy-phenyl)-indene

The synthesis was performed by the same procedure as in Metallocene Compound A (1-1) by using 4-methoxyphenylboronic acid in place of 4-trimethylsilylphenylboronic acid in the synthesis of 4-(4-trimethylsilyl-phenyl)-indene to obtain a yellow liquid of 4-(4-methoxy-phenyl)-indene in a yield of 89%.

(4-2) Synthesis of (4-(4-methoxy-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane

The synthesis was performed by the same procedure as in Metallocene Compound A (1-2) by using 4-(4-methoxy-phenyl)-indene in place of 4-(4-trimethylsilyl-phenyl)-indene to obtain a yellow liquid of (4-(4-methoxy-phenyl)-indenyl)(cyclopentadienyl)dimethylsilane in a yield of 35%.

(2-3) Synthesis of dimethylsilylene(4-(4-methoxy-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride

The synthesis was performed by the same procedure as in Metallocene Compound A (1-3) by using (4-(4-methoxy-phenyl)indenyl)(cyclopentadienyl)dimethylsilane in place of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane to obtain dimethylsilylene(4-(4-methoxy-phenyl)-indenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal (yield: 54%).

¹H-NMR Values (CDCl₃): δ0.86 (s, 3H), δ1.07 (s, 3H), δ3.86 (s, 3H), δ5.88 (m, 1H), δ5.92 (m, 1H), δ6.22 (d, 1H), δ6.77 (m, 1H), δ6.84 (m, 1H), δ7.00 (d, 2H), δ7.18 (m, 2H), δ7.40 (t, 2H), δ7.61 (d, 2H).

Metallocene Compound E: Synthesis of dimethylsilylene(4-phenylindenyl)(cyclopentadienyl)zirconium dichloride

The synthesis was performed by the same procedure as in Metallocene Compound A (1-3) by using (4-phenylindenyl)(cyclopentadienyl)dimethylsilane in place of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane to obtain dimethylsilylene(4-phenylindenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal.

Metallocene Compound F: Synthesis of dimethylsilylene(3-methylindenyl)(cyclopentadienyl)zirconium dichloride

The synthesis was performed by the same procedure as in Metallocene Compound A (1-3) by using (3-methylindenyl)(cyclopentadienyl)dimethylsilane in place of (4-(4-trimethylsilylphenyl)indenyl)(cyclopentadienyl)dimethylsilane to obtain dimethylsilylene(3-methylindenyl)(cyclopentadienyl)zirconium dichloride as a yellow crystal.

Metallocene Compound G: Synthesis of dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dichloride

The synthesis of dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dichloride was performed according to the procedure described in Macromolecules 1995, 28, 3771-3778.

Example 1-1

(1) Preparation of Solid Catalyst

In a nitrogen atmosphere, 5 g of silica calcined at 600° C. for 5 hours was put in a 200-ml two-neck flask and dried at reduced pressure with a vacuum pump for 1 hour while heating the flask in an oil bath at 150° C. In a nitrogen atmosphere, 68 mg of Metallocene Compound A was put in a separately prepared 100-ml two-neck flask and dissolved in 13.4 ml of dehydrated toluene, and to the resulting toluene solution of Metallocene Compound A, 8.6 ml of a 20% methylaluminoxane/toluene solution produced by Albemarle was added at room temperature and stirred for 30 minutes. While heating the 200-ml two-neck flask containing vacuum-dried silica in an oil bath at 40° C. and stirring the contents, the entire amount of the toluene solution above containing a reaction product of Metallocene Compound A and methylaluminoxane was added and stirred at 40° C. for 1 hour. While still heating the system at 40° C., the toluene solvent was removed by distillation under reduced pressure to obtain a solid catalyst.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the solid catalyst obtained in (1) Preparation of Solid Catalyst above.

That is, 30 ml of 1-hexene, 0.20 mmol of triethylaluminum, 200 ml of hydrogen and 800 mL of isobutane were added to a 2 L-volume autoclave with an induction stirring device, then, the temperature was raised to 75° C., and the ethylene partial pressure was kept at 1.4 MPa by introducing ethylene. Subsequently, 123 mg of the solid catalyst obtain in (1) Preparation of Solid Catalyst above was injected with nitrogen, and the polymerization was continued for 60 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C. Incidentally, during the polymerization reaction, additional feeding of 1-hexene was performed at a feed rate proportional to the ethylene consumption rate. The amount of 1-hexene fed additionally was 16.5 mL. The polymerization was stopped by adding ethanol. The amount of the thus-obtained ethylene⋅1-hexene copolymer was 130.3 g. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-2

An ethylene 1-hexene copolymer was produced in the same manner as in Example 1-1 except that 202 mg of the solid catalyst obtained in Example 1-1 was used, 40 ml of 1-hexene and 150 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 9.0 mL. As a result, 55.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-3

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 206 mg of the solid catalyst obtained in Example 1-1 was used and the amount of 1-hexene fed additionally was 9.0 mL. As a result, 82.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-4

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 217 mg of the solid catalyst obtained in Example 1-1 was used, 500 ml of hydrogen was added, and the amount of 1-hexene fed additionally was 6.0 mL. As a result, 54.8 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-5

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 204 mg of the solid catalyst obtained in Example 1-1 was used, 640 ml of hydrogen was added, and the amount of 1-hexene fed additionally was 5.0 mL. As a result, 45.5 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-1

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 59 mg of Metallocene Compound E in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 222 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 123 mg of the solid catalyst obtained in Example 1-1, 40 ml of 1-hexene was added, and the amount of 1-hexene fed additionally was 13.5 mL. As a result, 111.8 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-2

An ethylene⋅1-hexene copolymer was produced in the same manner as in Comparative Example 1-1 except that 218 mg of the solid catalyst obtained in Comparative Example 1-1 was used, 70 ml of 1-hexene and 20 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 1.5 mL. As a result, 24.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-3

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 52 mg of Metallocene Compound F in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 236 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 123 mg of the solid catalyst obtained in Example 1-1, 70 ml of 1-hexene and 20 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 18.0 mL. As a result, 146.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-4

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 50 mg of Metallocene Compound G in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 160 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 123 mg of the solid catalyst obtained in Example 1-1, 40 ml of 1-hexene and 100 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 7.2 mL. As a result, 31.4 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-6

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 64 mg of Metallocene Compound B in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 233 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 123 mg of the solid catalyst obtained in Example 1-1, 40 ml of 1-hexene and 100 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 2.0 mL. As a result, 29.2 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Comparative Example 1-7

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-6 except that 270 mg of the solid catalyst obtained in Example 1-6 was used, 70 ml of 1-hexene and 20 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 2.5 mL. As a result, 28.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-8

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 63 mg of Metallocene Compound D in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 1-1 except that 180 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 123 mg of the solid catalyst obtained in Example 1-1, 40 ml of 1-hexene and 100 ml of hydrogen were added, and the amount of 1-hexene fed additionally was 9.0 mL. As a result, 41.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 5a-1 and 5a-2.

Example 1-9

An ethylene⋅1-butene copolymer was produced using the solid catalyst obtained in (1) Preparation of Solid Catalyst of Example 1-1.

That is, 80 g of polyethylene-made pellets subjected to full dehydration and deoxidation and 33 mg of triethylaluminum were introduced into a stainless steel-made autoclave having an internal volume of 1 liter and having stirring and temperature control devices, and the temperature was raised to 90° C. under stirring. After introducing ethylene containing 10 wt % of 1-butene until the partial pressure became 2.0 MPa, 53 mg of the solid catalyst obtained above was injected with an argon gas, and polymerization was continued for 60 minutes by keeping the ethylene partial pressure of 2.0 MPa and the temperature of 90° C.

As a result, 14.6 g of an ethylene⋅1-butene copolymer was produced. The obtained copolymer had FR of 26.2 and a density of 0.918 g/cm³. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-10

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 54 mg of the solid catalyst obtained in Example 1-1 was used and 102 ml of hydrogen was added before the initiation of polymerization.

As a result, 10.8 g of an ethylene⋅1-butene copolymer was produced. The obtained copolymer had FR of 13.3 and a density of 0.930 g/cm³, and the number of terminal double bonds was 0.40 bonds/1000 carbons. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-11

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 104 mg of the solid catalyst obtained in Example 1-1 was used, 272 ml of hydrogen was added before the initiation of polymerization, ethylene containing 5 wt % of 1-butene was introduced in place of ethylene containing 10 wt % of 1-butene, and the polymerization was performed for 56 minutes.

As a result, 25.8 g of an ethylene⋅1-butene copolymer was produced. The FR of the obtained copolymer was 9.6. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-12

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 58 mg of the solid catalyst obtained in Example 1-1 was used and 51 ml of hydrogen was added before the initiation of polymerization.

As a result, 11.1 g of an ethylene⋅1-butene copolymer was produced. The FR of the obtained copolymer was 25.7. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-13

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 55 mg of the solid catalyst obtained in Example 1-1 was used and 153 ml of hydrogen was added before the initiation of polymerization.

As a result, 10.4 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 6a-1 and 6a-2.

Comparative Example 1-5

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 60 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst of Comparative Example 1-1 was used in place of 53 mg of the solid catalyst obtained in Example 1-1.

As a result, 13.2 g of an ethylene⋅1-butene copolymer was produced. The density of the obtained copolymer was 0.935 g/cm³, and the number of terminal double bonds was 0.30 bonds/1000 carbons. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-14

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 205 mg of the solid catalyst obtained in Example 1-6 was used in place of 53 mg of the solid catalyst obtained in Example 1-1 and 34 ml of hydrogen was added before the initiation of polymerization.

As a result, 29.1 g of an ethylene⋅1-butene copolymer was produced. The density of the obtained copolymer was 0.936 g/cm³, and the number of terminal double bonds was 0.40 bonds/1000 carbons. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 1-15

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 208 mg of the solid catalyst obtained in Example 1-6 was used in place of 53 mg of the solid catalyst obtained in Example 1-1 and 17 ml of hydrogen was added before the initiation of polymerization.

As a result, 25.8 g of an ethylene⋅1-butene copolymer was produced. The density of the obtained copolymer was 0.936 g/cm³, and the number of terminal double bonds was 0.40 bonds/1000 carbons. The polymerization results are shown in Tables 6a-1 and 6a-2.

Example 16

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 1-1 except for using 60 mg of Metallocene Compound C in place of 68 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 1-9 except that 203 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used in place of 53 mg of the solid catalyst obtained in Example 1-1 and the polymerization was performed for 47 minutes.

As a result, 29.5 g of an ethylene⋅1-butene copolymer was produced. The FR of the obtained copolymer was 9.4. The polymerization results are shown in Tables 6a-1 and 6a-2.

TABLE 59 [Table 5a-1] Catalyst Component (A) Component (B) Component (C) Amount Metal- Amount Amount Amount of Solid locene Used Used Used Catalyst Compound (mmol) Compound (mmol) Compound (g) (g) Example 1-1 A 0.00238 MAO 0.48 silica 0.095 0.123 Example 1-2 A 0.00389 MAO 0.78 silica 0.156 0.202 Example 1-3 A 0.00397 MAO 0.79 silica 0.159 0.206 Example 1-4 A 0.00418 MAO 0.84 silica 0.167 0.217 Example 1-5 A 0.00393 MAO 0.79 silica 0.157 0.204 Comparative E 0.00428 MAO 0.86 silica 0.171 0.222 Example 1-1 Comparative E 0.00420 MAO 0.84 silica 0.168 0.218 Example 1-2 Comparative F 0.00455 MAO 0.91 silica 0.182 0.236 Example 1-3 Comparative G 0.00309 MAO 0.62 silica 0.124 0.160 Example 1-4 Example 1-6 B 0.00448 MAO 0.90 silica 0.179 0.233 Example 1-7 B 0.00520 MAO 1.04 silica 0.208 0.270 Example 1-8 D 0.00346 MAO 0.69 silica 0.138 0.180 Polymerization Conditions Comonomer Addi- C2 Polymer- Hydrogen Initial tional Temp- Partial ization TEA H2/C2 Charge Amount erature Pressure Time (mmol) Solvent (%) (ml) (ml) (° C.) (MPa) (min) Example 1-1 0.20 isobutane 0.39 30.0 16.5 75 1.4 60 Example 1-2 0.20 isobutane 0.31 40.0 9.0 75 1.4 60 Example 1-3 0.20 isobutane 0.43 30.0 9.0 75 1.4 60 Example 1-4 0.20 isobutane 1.16 30.0 6.0 75 1.4 60 Example 1-5 0.20 isobutane 1.55 30.0 5.0 75 1.4 60 Comparative 0.20 isobutane 0.31 40.0 13.5 75 1.4 60 Example 1-1 Comparative 0.20 isobutane 0.09 70.0 1.5 75 1.4 60 Example 1-2 Comparative 0.20 isobutane 0.16 70.0 18.0 75 1.4 60 Example 1-3 Comparative 0.20 isobutane 0.20 40.0 7.2 75 1.4 60 Example 1-4 Example 1-6 0.20 isobutane 0.11 40.0 2.0 75 1.4 60 Example 1-7 0.20 isobutane 0.07 70.0 2.5 75 1.4 60 Example 1-8 0.20 isobutane 0.20 40.0 9.0 75 1.4 60 Metallocene Compound A

B

C

D

E

F

G

TABLE 5a-2 Catalyst Results Component (A) Activity MFR Metallocene Amount Used Yield (g-PE/ (g/10 Density λmax λmax λmax (2.0)/ Compound (mmol) (g) g-Cat/hr) min) FR (g/cm3) (2.0) (0.1) λmax (0.1) Example 1-1 A 0.00238 130.3 576 0.5 22.4 0.914 1.6 1.0 1.6 Example 1-2 A 0.00389 55.0 272 0.9 16.7 0.909 1.7 1.1 1.6 Example 1-3 A 0.00397 82.0 398 0.2 30.5 0.914 4.5 3.0 1.5 Example 1-4 A 0.00418 54.8 253 4.1 15.6 0.924 11.4  6.7 1.7 Example 1-5 A 0.00393 45.5 223 17.7 10.7 0.921 9.3 2.5 3.8 Comparative E 0.00428 111.8 503 1.1 17.4 0.914 1.4 1.0 1.4 Example 1-1 Comparative E 0.00420 24.0 110 8.5 5.9 0.907 6.4 1.2 5.5 Example 1-2 Comparative F 0.00455 146.0 618 3.2 13.4 0.920 3.8 1.7 2.2 Example 1-3 Comparative G 0.00309 31.4 196 8.1 9.5 0.929 6.5 2.6 2.5 Example 1-4 Example 1-6 B 0.00448 29.2 125 0.3 20.6 0.924 — — — Example 1-7 B 0.00520 28.0 104 4.8 8.1 0.917 3.5 1.3 2.8 Example 1-8 D 0.00346 41.0 228 19.2 9.4 0.934 — — — Results Amount of Amount of Amount of Amount of Soluble Soluble Soluble Soluble W_(c) Fraction Fraction Fraction Fraction g_(c)′ Value at −15° C. at 0° C. at 20° C. at 40° C. Mw ×10⁴ Mw/Mn Value (MW ≥10{circumflex over ( )}6) [wt %] [wt %] [wt %] [wt %] Example 1-1 12.9 7.4 0.41 4.5 0.3 0.5 1.6 4.5 Example 1-2 13.1 7.5 0.42 5.5 0.3 0.5 1.7 7.3 Example 1-3 15.3 9.2 0.42 5.8 0.3 0.4 1.4 4.0 Example 1-4 7.9 8.0 0.44 2.0 0.6 0.7 1.4 3.8 Example 1-5 5.9 6.8 0.45 0.9 1.0 1.2 2.3 7.4 Comparative 10.4 7.4 0.42 2.2 1.2 1.6 2.9 5.8 Example 1-1 Comparative 10.2 6.3 0.60 2.9 2.1 2.5 4.1 13.0  Example 1-2 Comparative 6.9 4.3 0.50  0.07 0.4 0.7 1.4 3.7 Example 1-3 Comparative 5.8 3.7 — — — — — — Example 1-4 Example 1-6 14.0 7.7 0.41 5.0 0.4 0.8 2.2 4.4 Example 1-7 10.3 6.1 0.45 3.0 0.7 1.0 2.5 9.7 Example 1-8 — — — — — — — —

TABLE 61 [Table 6a-1] Catalyst Component (A) Component (B) Component (C) Amount Metal- Amount Amount Amount of Solid locene Used Used Used Catalyst Example Compound (mmol) Compound (mmol) Compound (g) (g) Example 1-9 A 0.00103 MAO 0.21 silica 0.041 0.053 Example 1-10 A 0.00105 MAO 0.21 silica 0.042 0.054 Example 1-11 A 0.00202 MAO 0.40 silica 0.081 0.104 Example 1-12 A 0.00113 MAO 0.23 silica 0.045 0.058 Example 1-13 A 0.00107 MAO 0.21 silica 0.043 0.055 Comparative E 0.00116 MAO 0.23 silica 0.046 0.060 Example 1-5 Example 1-14 B 0.00398 MAO 0.90 silica 0.159 0.205 Example 1-15 B 0.00404 MAO 0.81 silica 0.162 0.208 Example 1-16 C 0.00394 MAO 0.79 silica 0.158 0.203 Polymerization Conditions Comonomer Addi- C2 Polymer- Hydrogen Initial tional Temper- Partial ization TEA H2/C2 Charge Amount ature Pressure Time Example (mmol) Solvent (%) (ml) (ml) (° C.) (MPa) (min) Example 1-9 0.30 gas 0.04 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 1-10 0.30 gas 0.36 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 1-11 0.30 gas 0.78 C4/C2 = 2.5 mol % 90 2.0 56 phase Example 1-12 0.30 gas 0.20 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 1-13 0.30 gas 0.41 C4/C2 = 5.0 mol % 90 2.0 60 phase Comparative 0.30 gas 0.36 C4/C2 = 5.0 mol % 90 2.0 60 Example 1-5 phase Example 1-14 0.30 gas 0.11 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 1-15 0.30 gas 0.03 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 1-16 0.30 gas 0.06 C4/C2 = 5.0 mol % 90 2.0 47 phase Metallocene Compound A

B

C

D

E

F

G

TABLE 6a-2 Catalyst Results Component (A) Activ- Terminal Metal- ity Den- λmax Double locene Amount (g-PE/ MFR sity Melting (2.0)/ Bond Com- Used Yield g-Cat/ (g/10 (g/ Point λmax λmax λmax Mw Mw/ (bonds/ g_(c)′ W_(c) Value Example pound (mmol) (g) hr) min) FR cm3) (° C.) (2.0) (0.1) (0.1) ×10⁴ Mn 1000C) Value (MW ≥10{circumflex over ( )}6) Example A 0.00103 14.6 275 0.05 26.2 0.918 104.5 — — — 20.4 5.7 — — — 1-9 Example A 0.00105 10.8 200 1.7 13.3 0.930 121.2 2.7 1.0 2.7 8.4 5.0 0.40 0.52 0.97 1-10 Example A 0.00202 25.8 266 16.1 9.6 — 126.6 5.7 1.9 3.0 4.6 4.8 — 0.77 0.29 1-11 Example A 0.00113 11.1 191 0.1 25.7 — 119.2 3.8 3.8 1.0 13.5 5.8 — 0.48 3.2 1-12 Example A 0.00107 10.4 189 9.5 — — 104.4 8.7 2.0 4.4 6.6 4.9 — 0.46 0.58 1-13 Compar- E 0.00116 13.2 220 6.4 — 0.935 120.5 6.9 2.1 3.3 6.6 3.7 0.30 0.44 0.7 ative Example 1-5 Example B 0.00398 29.1 142 12.3 — 0.936 121.9 5.2 1.9 2.7 7.2 4.4 0.40 0.49 0.71 1-14 Example B 0.00404 25.8 124 9.4 — 0.936 122.1 4.5 2.4 1.9 7.5 4.6 0.40 0.47 0.96 1-15 Example C 0.00394 29.5 186 8.5 9.4 — 109.5 13.5 10.7 1.3 8.4 4.5 — 0.41 1.6 1-16 <Evaluation>

As seen from the results shown in Tables 5a-1 and 5a-2, comparing Example 1-1 and Comparative Example 1-1, in Comparative Example 1-1 where the polymer was obtained using a catalyst not satisfying the requirements of the metallocene compound of the present invention, the amount of 1-hexene used as a comonomer was large, nevertheless, the density of the ethylene-based polymer was not reduced and therefore, it is apparent that the catalyst containing the metallocene compound of the present invention as a catalyst component is excellent in the activity as well as in the copolymerizability. Furthermore, in the same Comparative Example 1-1, the amount of hydrogen used as a chain transfer agent of polymerization was small, nevertheless, MFR of the ethylene-based polymer was not reduced, indicating no increase in the molecular weight, and therefore, it is apparent that the catalyst containing the metallocene compound of the present invention as a catalyst component has an excellent ability of producing an ethylene-based polymer having low MFR (high molecular weight). Moreover, in Example 1-1, all of [λmax(2.0)]_(B), [λmax(2.0)]_(B)/[λmax(0.1)]_(B), g_(C)′ and W_(C), which are characteristic values indicative of the property of a long-chain branch of enhancing the moldability of the ethylene-based polymer produced, were not inferior to those in Comparative Example 1-1 and in addition, the amount of soluble matter at −15° C. (W⁻¹⁵) was small, from which it is apparent that the olefin polymerization catalyst containing the metallocene compound of the present invention as a catalyst component is excellent in the moldability, mechanical properties and the like relative to the ethylene-based polymer obtained in Comparative Example 1-1 by using Metallocene Compound E that is known in Patent Document 4.

The results of Example 1-2 and Comparative Example 1-2 show that the superiority of the metallocene compound of the present invention is more clearly proved by performing an experiment of producing an ethylene-based polymer more reduced in the density than in Example 1-1. More specifically, in Comparative Example 1-2 where a catalyst not satisfying the requirements of the metallocene compound of the present invention was used, the influence due to increase of 1-hexene as a comonomer, that is, reduction in activity, increase of g_(C)′ (namely, decrease in the degree of long-chain branching) and increase in the amount of low-temperature soluble fraction, was prominent, whereas in Example 1-2 where the same experiment was performed, a drop of activity was recognized but the drop width was greatly smaller than in Comparative Example 1-2 and at the same time, neither all of characteristic values indicative of long-chain branching were deteriorated nor increase in the amount of low-temperature elution was observed. In other words, it is apparent from Tables 5a-1 and 5a-2 that the catalyst containing the metallocene compound of the present invention as a catalyst component has a marked superiority in the polymerization characteristics such as activity, the long-chain branching characteristics of an ethylene-based polymer, and the amount of a low-temperature eluting component.

Similarly, by comparing the results of Comparative Examples 1-3 and 1-4 using Metallocene Compound F or G known in Patent Document 5 with those of Examples 1-1 to 1-5, it is apparent that the metallocene compound of the present invention is excellent as an olefin polymerization catalyst component in terms of overall performance taking into account all of the polymerization activity, the copolymerizability, the ability to increase the molecular weight, the long-chain branching characteristics and the amount of a low-temperature eluting component.

Also, Examples 1-6 to 1-8 of Tables 5a-1 and 5a-2 show polymerization examples of Metallocene Compound B and Metallocene Compound D, which are the metallocene compound of the present invention different from that of Example 1-1. These metallocene compounds of the present invention were less effective than Metallocene Compound A of Example 1 or the like but exhibited high polymerization activity and furthermore, exhibited excellent long-chain branching characteristics represented by large λmax(2) value, large λmax(2)/λmax(0.1), small g_(C)′ value and large W_(C) value and in addition, since the W⁻¹⁵ was small and excellent product characteristics can be promised, it was confirmed that these are meaningful metallocene compounds.

In Tables 6a-1 and 6a-2, the catalyst containing the metallocene compound of the present invention is proved to have usefulness as a catalyst component also in gas-phase polymerization that is a polymerization process different from that of Tables 5a-1 and 5a-2. More specifically, comparing Examples 1-9 to 1-13 with Comparative Example 1-5, in Comparative Example 1-5 where the polymer was obtained using a catalyst not satisfying the requirements of the metallocene compound of the present invention, despite the same amount of 1-butene used as a comonomer, the density of the ethylene-based polymer was increased and therefore, it is apparent that the catalyst containing the metallocene compound of the present invention as a catalyst component is excellent in the activity and at the same time, excellent in the copolymerizability. Furthermore, in the same Comparative Example 1-5, the amount of hydrogen used as a chain transfer agent of polymerization was equal, nevertheless, MFR of the ethylene-based polymer was not reduced relative to Example 1-10, indicating no increase in the molecular weight, and therefore, it is apparent that the catalyst containing the metallocene compound of the present invention as a catalyst component has an excellent ability of producing an ethylene-based polymer having low MFR (high molecular weight). Moreover, in Examples 1-9 to 1-13, all of [λmax(2.0)]_(B), [λmax(2.0)]_(B)/[λmax(0.1)]_(B), g_(C)′ and W_(C), which are characteristic values indicative of the property of a long-chain branch of enhancing the moldability of the ethylene-based polymer produced, were not inferior to those in Comparative Example 1-5.

Also, Examples 1-14 to 1-16 of Tables 6a-1 and 6a-2 show polymerization examples of Metallocene Compound B and Metallocene Compound C, which are the metallocene compound of the present invention different from those of Examples 1-9 to 1-13. These metallocene compounds of the present invention exhibited high polymerization activity comparable to that of Metallocene Compound A of Example 1-10 or the like and furthermore, exhibited any of large λmax(2) value, large λmax(2)/λmax(0.1), small g_(C)′ value and large W_(C) value and since product characteristics excellent in the moldability can be promised, it was confirmed that these are meaningful metallocene compounds.

(II) Synthesis of Metallocene Compound

The following metallocene compounds were synthesized and the used as a catalyst component.

[Synthesis Example 1 of Metallocene Compound] (Hereinafter, Sometimes Simply Referred to as “Metallocene Compound A”)

Synthesis of dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride was performed according to the procedure described in Example 1 of JP-A-09-87314.

[Synthesis Example 2 of Metallocene Compound](Hereinafter, Sometimes Simply Referred to as “Metallocene Compound E”)

Synthesis of dimethylsilylene(3-tert-butylcyclopentadienyl)(cyclopentadienyl)zirconium dichloride was performed according to the procedure described in J. AM. CHEM. SOC. 2004, 126, 2089-2104.

[Synthesis Example 3 of Metallocene Compound](Hereinafter, Sometimes Simply Referred to as “Metallocene Compound F”)

Synthesis of dimethylsilylene(cyclopentadienyl)(indenyl)zirconium dichloride was performed according to the procedure described in Macromolecules 1995, 28, 3771-3778.

[Synthesis Example 4 of Metallocene Compound](Hereinafter, Sometimes Simply Referred to as “Metallocene Compound B”)

Synthesis of dimethylsilylene(4-tert-butylcyclopentadienyl)(indenyl)hafnium dichloride was performed by the same method as in [Synthesis Example 1] by using hafnium tetrachloride.

[Synthesis Example 5 of Metallocene Compound](Hereinafter, Sometimes Simply Referred to as “Metallocene Compound C”)

Synthesis of dimethylsilylene(3-trimethylsilylcyclopentadienyl)(indenyl)zirconium dichloride was performed by the same method as in [Synthesis Example 1] by using (3-trimethylsilylcyclopentadienyl)(indenyl)dimethylsilane.

[Synthesis Example 6 of Metallocene Compound](Hereinafter, Sometimes Simply Referred to as “Metallocene Compound D”)

Synthesis of isopropylidene(4-tert-butylcyclopentadienyl)(indenyl)zirconium dichloride was performed by the same method as in [Synthesis Example 1] by using (4-tert-butylcyclopentadienyl)(indenyl)dimethylmethane, and the target metallocene was obtained as an isomeric mixture.

Example 2-1

(1) Preparation of Solid Catalyst

In a nitrogen atmosphere, 5 g of silica calcined at 600° C. for 5 hours was put in a 200-ml two-neck flask and dried at reduced pressure with a vacumn pump for 1 hour while heating the flask in an oil bath at 150° C. In a nitrogen atmosphere, 57 mg of Metallocene Compound A was put in a separately prepared 100-ml two-neck flask and dissolved in 13.4 ml of dehydrated toluene, and to the resulting toluene solution of Metallocene Compound A, 8.6 ml of a 20% methylaluminoxane/toluene solution produced by Albemarle was added at room temperature and stirred for 30 minutes. While heating the 200-ml two-neck flask containing vacuum-dried silica in an oil bath at 40° C. and stirring the contents, the entire amount of the toluene solution above containing a reaction product of Metallocene Compound A and methylaluminoxane was added and stirred at 40° C. for 1 hour. While still heating the system at 40° C. the toluene solvent was removed by distillation under reduced pressure to obtain a solid catalyst.

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced using the solid catalyst obtained in (1) Preparation of Solid Catalyst above.

That is, 80 g of polyethylene-made pellets subjected to fill dehydration and deoxidation and 33 mg of triethylaluminum were introduced into a stainless steel-made autoclave having an internal volume of 1 liter and having stirring and temperature control devices, and the temperature was raised to 90° C. under stirring. After introducing ethylene containing 10 wt % of 1-butene until the partial pressure became 2.0 MPa, 50 mg of the solid catalyst obtained above was injected with an argon gas, and polymerization was performed for 60 minutes.

As a result, 20.3 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Comparative Example 2-1

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 51 mg of Metallocene Compound E obtained in Synthesis Example 2 in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 2-1 except that 56 mg of the solid catalyst obtained in Preparation of Solid Catalyst above was used in place of 50 mg of the solid catalyst obtained in Example 2-1 and the polymerization was performed at a polymerization temperature of 80° C. for 51 minutes.

As a result, 25.8 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Example 2-2

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the solid catalyst obtained in Example 2-1.

That is, 50 g of polyethylene-made pellets subjected to full dehydration and deoxidation and 0.20 mmol of triethylaluminum were introduced into a stainless steel-made autoclave having an internal volume of 2 liter and having stirring and temperature control devices, and the temperature was raised to 75° C. under stirring. After introducing 1.5 ml of 1-hexene and ethylene until the partial pressure became 1.4 MPa, 64 mg of the solid catalyst obtained above was injected with a nitrogen gas, and polymerization was performed for 90 minutes. Incidentally, during the polymerization reaction, additional feeding of 1-hexene was performed at a feed rate proportional to the ethylene consumption rate. As a result, the molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and just prior to stopping of the polymerization was 0.093% and 0.104%, respectively, and the amount of 1-hexene additionally fed was 9.5 mL. As a result, 49.5 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Comparative Example 2-2

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 2-2 except that 62 mg of the solid catalyst obtained in Preparation of Solid Catalyst of Comparative Example 2-1 was used in place of 64 mg of the solid catalyst obtained in Example 2-1. However, the amount of 1-hexene additionally fed was 7.5 mL. The molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and just prior to stopping of the polymerization was 0.122% and 0.137%, respectively. As a result, 42.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Comparative Example 2-3

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 50 mg of Metallocene Compound F obtained in Synthesis Example 3 in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 2-1 except that 194 mg of the solid catalyst obtained in (1) Preparation of Solid Catalyst above was used, ethylene containing 10 wt % of 1-hexene was used in place of ethylene containing 10 wt % of 1-butene, and the polymerization temperature was set to 70° C.

As a result, 13.7 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Reference Example 2-1

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 2-1 except that 52 mg of the solid catalyst obtained in Example 2-1 was used and ethylene containing 10 wt % of 1-hexene was used in place of ethylene containing 10 wt %° of 1-butene.

As a result, 17.5 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Comparative Example 2-4

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 44 mg of Metallocene Compound G produced by Wako Pure Chemical Industries, Ltd. in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced in the same manner as in Example 2-1 except that 49 mg of the solid catalyst obtained in Preparation of Solid Catalyst above was used and ethylene containing 5 wt % of 1-hexene was used in place of ethylene containing 10 wt % of 1-butene.

As a result, 4.5 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Comparative Example 2-5

(1) Production of Ethylene Polymer

An ethylene polymer was produced using the solid catalyst obtained in Preparation of Solid Catalyst of Comparative Example 2-4.

That is, 800 mL of isobutane and 0.20 mmol of triethylaluminum were added to a 2 L-volume autoclave with an induction stirring device, the temperature was raised to 75° C., and the ethylene partial pressure was kept at 1.4 MPa by introducing ethylene. Subsequently, 525 mg of the solid catalyst of Comparative Example 2-4 was injected with nitrogen and after continuing the polymerization for 60 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C., the polymerization was stopped by adding ethanol. The molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part just prior to stopping of the polymerization was 0.088%. The amount of the thus-obtained ethylene polymer was 60.0 g. The polymerization results are shown in Tables 7a-1 and 7a-2.

Example 2-3

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 2-1 except that 55 mg of the solid catalyst obtained in Example 2-1 was used and the polymerization was performed at a polymerization temperature of 70° C. for 31 minutes.

As a result, 25.6 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Reference Example 2-2

(1) Preparation of Triethylaluminum-Treated Montmorillonite

In a nitrogen atmosphere, 3.0 g of commercially available montmorillonite was put in a 200-ml two-neck flask and dried at reduced pressure with a vacuum pump for 1 hour while heating the flask in an oil bath at 200° C. After cooling to room temperature. 75 ml of heptane was added to make a slurry, and 14.4 ml of triethylaluminum (a heptane solution at a concentration of 70 g/liter) was added with stirring. After stirring at room temperature for 1 hour, the solid was washed by decantation to a dilution ratio of 1/100. Finally, heptane was added until reaching a liquid volume of 150 ml to obtain a slurry of triethylahuninum-treated montmorillonite.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the triethylaluminum-treated montmorillonite of (l) above.

That is, 500 ml of heptane subjected to full dehydration, 55 mg of triethylaluminum and 10 ml of 1-hexene were introduced into a stainless steel-made autoclave having an internal volume of I liter and having stirring and temperature control devices, and the temperature was raised to 80° C. under stirring. After introducing ethylene until the partial pressure became 1.5 MPa, 50 mg of the triethylaluninum-treated mountmorillonite (2.5 ml of a heptane slurry) and 2.5 micromol of Metallocene Compound A were injected with an argon gas, and polymerization was performed for 60 minutes. During the polymerization reaction, the pressure was kept at 1.5 MPa by introducing ethylene containing 10 wt % of 1-hexene according to the ethylene consumption in the system.

As a result, 3.0 g of an ethylene⋅1-hexene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Example 2-4

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 68 mg of Metallocene Compound B obtained in Synthesis Example 2-4 in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 2-1 except that 210 mg of the solid catalyst obtained in Preparation of Solid Catalyst above was used in place of 50 mg of the solid catalyst obtained in Example 2-1 and 34 ml of hydrogen was added.

As a result, 10.0 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Example 2-5

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 59 mg of Metallocene Compound C obtained in Synthesis Example 5 in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Butene Copolymer

An ethylene⋅1-butene copolymer was produced in the same manner as in Example 2-1 except that 54 mg of the solid catalyst obtained in Preparation of Solid Catalyst above was used in place of 50 mg of the solid catalyst obtained in Example 2-1.

As a result, 16.5 g of an ethylene⋅1-butene copolymer was produced. The polymerization results are shown in Tables 7a-1 and 7a-2.

Example 2-6

(1) Preparation of Solid Catalyst

A solid catalyst was prepared in the same manner as in Example 2-1 except for using 55 mg of Metallocene Compound D obtained in Synthesis Example 6 in place of 57 mg of Metallocene Compound A.

(2) Production of Ethylene⋅1-Hexene Copolymer

An ethylene⋅1-hexene copolymer was produced using the solid catalyst obtained in (1) Preparation of Solid Catalyst above.

That is, 800 mL of isobutane, 40 mL of 1-hexene and 0.20 mmol of triethylaluminum were added to a 2 L-volume autoclave with an induction stirring device, the temperature was raised to 75° C., and the ethylene partial pressure was kept at 1.4 MPa by introducing ethylene.

Subsequently, 180 mg of the solid catalyst obtained in (1) above was injected with nitrogen and after continuing the polymerization for 60 minutes by keeping the ethylene partial pressure of 1.4 MPa and the temperature of 75° C., the polymerization was stopped by adding ethanol. Incidentally, during the polymerization reaction, additional feeding of 1-hexene was performed at a feed rate proportional to the ethylene consumption rate. As a result, the average molar ratio of H₂/C₂ (hydrogen/ethylene) in the autoclave gas phase part at 10 minutes after the initiation of polymerization and just prior to stopping of the polymerization was 0.098%0, and the amount of 1-hexene fed additionally was 12 mL. The amount of the thus-obtained ethylene-based polymer was 48.5 g. The polymerization results are shown in Tables 7a-1 and 7a-2.

TABLE 63 [Table 7a-1] Catalyst Component (A) Component (B) Component (C) Amount Metal- Amount Amount Amount of Solid locene Used Used Used Catalyst Compound (mmol) Compound (mmol) Compound (g) (g) Example 2-1 A 0.00097 MAO 0.19 silica 0.039 0.050 Comparative E 0.00109 MAO 0.22 silica 0.044 0.056 Example 2-1 Example 2-2 A 0.00123 MAO 0.25 silica 0.049 0.064 Comparative E 0.00120 MAO 0.24 silica 0.048 0.062 Example 2-2 Comparative F 0.00376 MAO 0.75 silica 0.150 0.194 Example 2-3 Reference A 0.00099 MAO 0.20 silica 0.040 0.052 Example 2-1 Comparative G 0.00142 MAO 0.28 silica 0.057 0.049 Example 2-4 Comparative G 0.01010 MAO 2.02 silica 0.404 0.525 Example 2-5 Example 2-3 A 0.00107 MAO 0.21 silica 0.043 0.055 Reference A 0.00250 montmo- 0.050 g — — 0.050 Example 2-2 rillonite Example 2-4 B 0.00407 MAO 0.81 silica 0.163 0.210 Example 2-5 C 0.00105 MAO 0.21 silica 0.042 0.054 Example 2-6 D 0.00346 MAO 0.69 silica 0.138 0.180 Polymerization Conditions Comonomer C2 Polymer- Hydrogen Initial Additional Temper- Partial ization TEA H2/C2 Charge Amount ature Pressure Time (mmol) Solvent (%) (ml) (ml) (° C.) (MPa) (min) Example 2-1 0.30 gas 0.030 C4/C2 = 5.0 mol % 90 2.0 60 phase Comparative 0.30 gas 0.028 C4/C2 = 5.0 mol % 80 2.0 51 Example 2-1 phase Example 2-2 0.20 gas 0.098 1.5 ml 9.5 ml 75 1.4 90 phase Comparative 0.20 gas 0.129 1.5 ml 7.5 ml 75 1.4 90 Example 2-2 phase Comparative 0.30 gas 0.022 C6/C2 = 3.3 mol % 70 2.0 60 Example 2-3 phase Reference 0.30 gas 0.009 C6/C2 = 3.3 mol % 90 2.0 60 Example 2-1 phase Comparative 0.30 gas 0.015 C6/C2 = 1.7 mol % 90 2.0 105 Example 2-4 phase Comparative 0.20 iso- 0.088 — — 75 1.4 60 Example 2-5 butane Example 2-3 0.30 gas 0.026 C4/C2 = 5.0 mol % 70 2.0 31 phase Reference 0.50 heptane 0.004  10 ml C6/C2 = 80 1.5 60 Example 2-2 3.3 mol % Example 2-4 0.30 gas 0.080 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 2-5 0.30 gas 0.030 C4/C2 = 5.0 mol % 90 2.0 60 phase Example 2-6 0.20 iso- 0.098  40 ml  12 ml 75 1.4 60 butane Metallocene Compound A

B

C (isomeric mixture)

D (isomeric mixture)

E

F

G

TABLE 7a-2 Catalyst Results Component (A) Activ- Terminal Metal- ity Den- λmax Double locene Amount (g-PE/ MFR sity (2.0)/ Bond Com- Used Yield g-Cat/ (g/10 (g/ λmax λmax λmax Mw Mw/ (bonds/ g_(c)′ W_(c) Value pound (mmol) (g) hr) min) FR cm3) (2.0) (0.1) (0.1) ×10⁴ Mn 1000 C.) Value (MW ≥10{circumflex over ( )}6) Example A 0.00097 20.3 406 16.6 — 0.938 7.0 4.9 1.4 6.1 3.8 0.30 0.44 1.0 2-1 Compar- E 0.00109 25.8 542 11.3 — 0.940 4.2 3.4 1.2 5.9 2.7 0.63 0.62 0.1 ative Example 2-1 Example A 0.00123 49.5 516 38.3 — 0.927 — — — 4.4 3.3 — 0.36 0.8 2-2 Compar- E 0.00120 42.0 451 23.9 8.0 0.930 4.7 3.1 1.5 4.9 3.2 — 0.38  0.09 ative Example 2-2 Compar- F 0.00376 13.7 70 15.1 6.1 0.931 36.7 19.6 1.9 5.5 3.8 0.35 0.79 0.7 ative Example 2-3 Reference A 0.00099 17.5 337 0.05 (HL) — 0.912 — — — 58.4 3.4 0.00 — — Example 2-1 Compar- G 0.00142 4.5 52 22.7 — 0.958 10.9 18.9 0.6 5.3 4.1 1.31 0.90 0.9 ative Example 2-4 Compar- G 0.01010 60.0 114 11.5 9.5 0.960 7.0 7.0 1.0 5.7 3.9 — — — ative Example 2-5 Example A 0.00107 25.6 902 1.3 13.0  0.930 2.8 1.5 1.9 7.5 3.7 — — — 2-3 Reference A 0.00250 3.0 60 0.02 (HL) — 0.920 — — — 106.0 2.9 0.23 — — Example 2-2 Example B 0.00407 10.0 48 7.8 7.9 0.945 — — — 6.8 4.1 — 1.00 0.5 2-4 Example C 0.00105 16.5 306 9.7 6.9 0.942 3.0 1.8 1.7 7.2 4.0 — 1.00 0.2 2-5 Example D 0.00346 48.5 270 116 — 0.935 — — — 2.8 3.3 — 0.74 0.2 2-6

As seen from the results shown in Tables 7a-1 and 7a-2, comparing Example 2-1 and Comparative Example 2-1 or comparing Example 2-2 and Comparative Example 2-2, in the ethylene-based polymers of Comparative Examples 2-1 and 2-2 obtained using a catalyst not satisfying the requirements of the metallocene compound of the present invention, the [λmax(2.0)]_(B) of the requirement (B-4′-i) or [λmax(2.0)]_(B)/[λmax(0.1)]_(B) of the requirement (B-4′-ii) was inferior, g_(C)′ of the requirement (B-4′-iii) was not sufficiently reduced, or W_(C) of the requirement (B-4′-iv) was poor. From these, it is apparent that the ethylene-based polymer produced in Examples according to the present invention is excellent in the moldability.

Also, as compared with the polymerization activity in Examples 2-1 and 2-2 of Tables 7a-1 and 7a-2, the polymerization activity in ethylene polymerization by a catalyst not satisfying the requirements of the metallocene compound of the present invention was significantly low as seen in Comparative Examples 2-3 to 2-5, and evidently, there is a problem in profitability as the production method of an ethylene-based polymer. Furthermore, [λmax(2.0)]_(B) of the ethylene-based polymer obtained in Comparative Example 2-3 was too large, and this clearly indicates that only an ethylene-based polymer with poor strength can be obtained. In addition, the ethylene-based polymer obtained in Comparative Example 2-4 or 2-5 was poor in the [λmax(2.0)]_(B)/[λmax(0.1)]_(B) of the requirement (B-4′-ii). From these, it is apparent that the ethylene-based polymer produced in Examples according to the present invention is excellent in the moldability and excellent also in the profitability.

Examples 2-4 to 2-6 of Tables 7a-1 and 7a-2 are a case using a metallocene compound differing in the structure from the catalyst satisfying the requirements of the metallocene compound of the present invention used in Examples 2-1 to 2-3.

In the case of the metallocene compound of Example 2-4 which differs from the metallocene compound of Example 2-1 only in that the center metal species is Hf or Zr, while having the same ligand structure, the activity was inferior to that in Example 2-1, but W_(C) of the requirement (B-4′-iv) of the present invention showed a relatively large value, and it is estimated that the ethylene-based polymer has adequately excellent moldability.

In the case of the metallocene compound of Example 2-5 which differs from the metallocene compound of Example 2-1 only in that the substituent on the cyclopentadienyl ring is a trimethylsilyl group or a tert-butyl group, while having the same structure in the rest, high activity equal to that in Example 2-1 was exhibited and the requirements (B-4′-i), (B-4′-ii) and (B-4′-iv) of the present invention were fully satisfied, indicating that the ethylene-based polymer is excellent in the moldability.

In the case of the metallocene compound of Example 2-6 which differs from the metallocene compound of Example 2-1 only in that the bridging group connecting the cyclopentadienyl ring and the indenyl ring is an i-propyl group or a dimethylsilylene group, while having the same structure in the rest, high activity equal to that in Example 2-1 was exhibited and the requirements (B-4′-iv) was satisfied, indicating that the ethylene-based polymer is excellent in the moldability.

From these, it is verified that all of ethylene-based polymers produced with catalysts using metallocene compounds belonging to the present invention can express sufficiently improved moldability.

While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention. This application is based on Japanese Patent Application (Patent Application No. 2011-073937) filed on Mar. 30, 2011, and Japanese Patent Application (Patent Application No. 2011-073945) filed on Mar. 30, 2011, the contents of which are incorporated herein by way of reference.

INDUSTRIAL APPLICABILITY

As clearly understood from the description in the foregoing pages, the polyethylene-based resin composition of the present invention has excellent molding characteristics and at the same time, has an effect that the balance between impact strength and stiffness is excellent and furthermore, the transparency is excellent. In addition, the molded product obtained by the injection molding, compression-injection molding, rotational molding, extrusion molding, hollow molding or blow molding of the polyethylene-based resin composition is also excellent in the balance between impact strength and stiffness as well as in the transparency, so that a molded product reduced in the wall thickness can be provided in an economically advantageous manner.

Accordingly, the polyethylene-based resin composition of the present invention capable of providing a molded product having such desired properties in an economically advantageous manner has a significantly high industrial value.

Moreover, an olefin polymerization catalyst capable of introducing a sufficiently large number of appropriate length long-chain branches into an olefin polymer is obtained by using the olefin polymerization catalyst component of the present invention, and an olefin-based polymer usefiul, for example, in substituting for a high-pressure low-density polyethylene excellent in moldability, substituting for a high-density polyethylene obtained with a chromium-based catalyst, or improving the moldability of a metallocene polymer is obtained. For these reasons, the olefin polymerization catalyst of the present invention is of high significance and has very great industrial applicability. 

The invention claimed is:
 1. An olefin polymerization catalyst component, comprising a metallocene compound represented by the following formula (1c):

in formula (1c), M^(1c) represents any one transition metal of Ti, Zr and Hf; each of X^(1c) and X^(2c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom or a nitrogen atom and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, or an alkoxy group having a carbon number of 1 to 20; each of Q^(1c) and Q^(2c) independently represents a carbon atom, a silicon atom or a germanium atom; each R^(1c) independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 10 and at least two members out of four R^(1c) may combine to form a ring together with Q^(1c) and Q^(2c); m^(c) is 0 or 1 and when m^(c) is 0, Q^(1c) is bonded directly to the conjugated 5-membered ring including R^(2c); each of R^(2c) and R^(4c) independently represents a hydrogen atom, a halogen atom, a hydrocarbon group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing an oxygen atom and having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; and R^(3c) represents a substituted aryl group represented by the following formula (1-ac):

in formula (1-ac), Y^(1c) represents an atom of Group 14, Group 15 or Group 16 of the periodic table; each of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) independently represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing oxygen or nitrogen and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20; adjacent groups of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) may combine with each other to form a ring together with the atoms bonded to these groups; n^(c) is 0 or 1 and when n^(c) is 0, the substituent R^(5c) is not present on Y^(1c); and p^(c) is 0 or 1 and when p^(c) is 0, the carbon atom to which R^(7c) is bonded and the carbon atom to which R^(9c) is bonded are bonded directly; provided that when Y^(1c) is a carbon atom, at least one of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) is not a hydrogen atom.
 2. An olefin polymerization catalyst, comprising the olefin polymerization catalyst component of claim
 1. 3. A production method of an ethylene-based polymer, comprising polymerizing a monomer in the presence of an olefin polymerization catalyst comprising the following components (A) and (B): component (A): the olefin polymerization catalyst component of claim 1, and component (B): a compound capable of reacting with the metallocene compound of the formula (1c) of the component (A) to produce a cationic metallocene compound.
 4. An olefin polymerization catalyst, comprising the following components (A) and (B): component (A): the olefin polymerization catalyst component of claim 1, and component (B): a compound capable of reacting with the metallocene compound of the formula (1c) of the component (A) to produce a cationic metallocene compound.
 5. The olefin polymerization catalyst component as claimed in claim 1, wherein m^(c) is
 0. 6. The olefin polymerization catalyst component as claimed in claim 1, wherein said Y^(1c) represents an atom of Group 14 or Group 16 of the periodic table.
 7. The olefin polymerization catalyst component as claimed in claim 1, wherein none of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) represent a fluorine atom.
 8. The olefin polymerization catalyst component as claimed in claim 1, wherein said each of R^(5c), R^(6c), R^(7c), R^(8c) and R^(9c) independently represents a hydrogen atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to
 20. 9. The olefin polymerization catalyst component as claimed in claim 1, wherein the metallocene compound represented by the formula (1c) is a metallocene compound represented by the following formula (2c),

where in formula (2c) M^(1c), X¹, X^(2c), Q^(1c), R^(1c), R^(2c) and R^(4c) have the same definitions as for formula (1c), and R^(10c) represents a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing oxygen or nitrogen and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to
 20. 10. The olefin polymerization catalyst component as claimed in claim 1, wherein the metallocene compound represented by the formula (1c) is a metallocene compound represented by the following formula (3c),

in formula (3c) M^(1c), X^(1c), X^(2c), Q^(1c), R^(1c), R^(2c) and R^(4c) have the same definitions as for formula (1c), R^(12c), R^(13c), and R^(14c) independently represent a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a hydrocarbon group having a carbon number of 1 to 20, a hydrocarbon group containing oxygen or nitrogen and having a carbon number of 1 to 20, a hydrocarbon group-substituted amino group having a carbon number of 1 to 20, an alkoxy group having a carbon number of 1 to 20, a silicon-containing hydrocarbon group containing from 1 to 6 silicons and having a carbon number of 1 to 18, a halogen-containing hydrocarbon group having a carbon number of 1 to 20, or a hydrocarbon group-substituted silyl group having a carbon number of 1 to 20, and Z^(1c) represents an oxygen atom or a sulfur atom. 